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Difference between revisions of "Delay block"

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__TOC__
 
__TOC__
[[image:Iii-delay.jpg|325px]]
+
 
 
=Available on which products=
 
=Available on which products=
  
 
* '''Axe-Fx III''': 4 blocks
 
* '''Axe-Fx III''': 4 blocks
* '''FM3''': 2 blocks
+
* '''FM3''', '''FM9''': 2 blocks
* '''Axe-Fx II''': 2 blocks
+
* '''Axe-Fx II''', '''FX8''', '''AX8''': 2 blocks
* '''FX8''': 2 blocks
+
 
* '''AX8''': 2 blocks
+
=Channels or X/Y=
 +
 
 +
* '''Axe-Fx III''', '''FM9''', '''FM3''': 4 channels
 +
* '''Axe-Fx II''', '''FX8''', '''AX8''': X/Y
  
=Channels or X/Y switching=
+
=Delay block diagrams=
  
* '''Axe-Fx III''' and '''FM3''': 4 channels
+
[[image:Delay block - Mono.PNG|450px]]
* '''Axe-Fx II''': X/Y
 
* '''FX8''': X/Y
 
* '''AX8''': X/Y
 
  
=Position of the Delay block on the grid=
+
[[image:Delay block - Mono Tape.PNG|400px]]
  
Just like in analog rigs, there's a difference between the Delay effect positioned before the amp and after the amp, especially when using distorted amp tones. It's up to you. Most people place Delay effects after the Amp block, but delay-before-amp certainly has its own charm.
+
[[image:Delay block - Stereo.PNG|400px]]
  
'''Before the Amp block''' — this will distort the delay trails and make them louder because of compression
+
[[image:Dual Delay.png|200px]]
  
'''After the Amp block''' — this results in cleaner-sounding delays
+
=Delay types=
  
<blockquote>"Sounds like you have the delay before the amp. This is normal behavior when putting a delay before a distorted (and therefore compressing) amp." [http://forum.fractalaudio.com/threads/ax-8-firmware-version-10-00.141474/page-6#post-1677316 source] </blockquote>
+
Firmware 17.01 and later:
  
About the position of the Delay block relative to the Reverb block:
+
# 2290 W/ Modulation
 +
# Ambient Stereo
 +
# Analog Mono
 +
# Analog Stereo
 +
# Deluxe Mind Guy
 +
# Diffused Delay (not available on the FM3, because the FM3's Delay block doesn't support Diffusion)
 +
# Digital Mono
 +
# Digital Stereo
 +
# DM-Two Delay
 +
# Dual Delay
 +
# Ducking Delay
 +
# Graphite Copy Delay
 +
# Lo-Fi Tape
 +
# Mono BBD
 +
# Mono Tape
 +
# Pan Delay (Axe-Fx III only)
 +
# Ping-Pong
 +
# Reverse Delay
 +
# Stereo BBD
 +
# Stereo Mind Guy
 +
# Stereo Tape
 +
# Stereo Trem Delay (Axe-Fx III only)
 +
# Sweep Delay
 +
# Vintage Digital
 +
# Wandering Delays (Axe-Fx III only)
 +
# Worn Tape
 +
# Zephyr: FAS original [https://forum.fractalaudio.com/threads/zephyr-delay-what-is-it.178128/post-2170358] (not available on the FM3, because the FM3's Delay block doesn't support Diffusion))
 +
# Dual Head Tape Delay (added in firmware 23)
  
<blockquote>"If there isn't distortion or modulation in the delay/reverb then the order is irrelevant since they are then Linear Time Invariant (or shift invariant in digital parlance). If there is a small amount of distortion or modulation then the order is probably still irrelevant. If there is a lot of distortion or modulation then the order may make a difference. However, typically the biggest difference, as noted above, is series vs. parallel since h1(t)*h2(t) is not the same as h1(t)+h2(t). If LTI h1*h2 = h2*h1. It may seem counter-intuitive that the order doesn't matter but try it and you'll be surprised." [http://forum.fractalaudio.com/threads/delay-before-reverb-or-reverb-before-delay-whats-your-preference.57690/page-2#post-723087 source]</blockquote>
+
The following blocks are also capable of providing a delay effect:
  
Read this: [[Presets#PRE_and_POST_routing|PRE and POST routing]]
+
* [[Multitap Delay block]]
 +
* [[Ten-Tap Delay block]]
 +
* [[Megatap Delay block]]
 +
* [[Plex Delay block]]
 +
* [[Pitch block]]
  
=Delay block and CPU usage=
+
Looper functionality (also a delay) is provided through the dedicated [[Looper block]].
  
Some Delay types, such as Tape and Ambient, require substantially more CPU than other types.
+
Additional information is in the [[Owners_Manuals|Owner's Manual]].
  
=Spillover=
+
==Deluxe Memory Guy==
 +
 
 +
<blockquote>'''FRACTAL AUDIO QUOTES'''<HR>
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/deluxe-mind-guy.180406/post-2205247]
 +
The model is matched to an original, not reissue, DMM.
 +
</blockquote>
 +
</blockquote>
 +
 
 +
==Vintage Digital Delay==
  
Read this: [[Spillover]]
+
<blockquote>'''FRACTAL AUDIO QUOTES'''<HR>
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/vintage-digital-delay-small-buzz-or-digital-artifact.200612/#post-2503381]
 +
It uses virtual crappy converters with low bit depth.
 +
</blockquote>
  
=Delay types=
+
<blockquote>
 +
[https://forum.fractalaudio.com/threads/axe-fx-iii-firmware-24-04-release.201076/page-7]
 +
The whole point of the Vintage Digital type is the artifacts. It's modeling an early, primitive digital delay w/ an 8-bit converter.
 +
</blockquote>
  
The Delay block in firmware Ares has these types:
+
<blockquote>
 +
[https://forum.fractalaudio.com/threads/axe-fx-iii-firmware-24-04-release.201076/page-7#post-2511404]
 +
Just modeled it after how devices in that era worked.
 +
</blockquote>
 +
</blockquote>
  
# '''Digital Mono'''
+
==DM-Two Delay==
# '''Digital Stereo'''
 
# '''Analog Mono'''
 
# '''Analog Stereo'''
 
# '''Mono Tape'''
 
# '''Stereo Tape'''
 
# '''Ping-Pong Delay'''
 
# '''Dual Delay'''
 
# '''Reverse Delay'''
 
# '''Sweep Delay'''
 
# '''Ducking Delay'''
 
# '''Vintage Digitalv
 
# '''2290 w/ Modulation'''
 
# '''Ambient Stereo'''
 
# '''Deluxe Mind Guy'''
 
# '''Mono BBD'''
 
# '''Stereo BBD'''
 
# '''Lo-Fi Tape'''
 
  
The following blocks in the Axe-Fx III are capable of providing a delay effect:
+
<blockquote>'''FRACTAL AUDIO QUOTES'''<HR>
* '''Delay'''
+
<blockquote>
* '''Multitap Delay'''
+
[https://forum.fractalaudio.com/threads/axe-fx-firmware-version-21-01.189535/post-2364958]
* '''Ten-Tap Delay'''
+
[…]
* '''Megatap Delay'''
+
the DM-2 has a pre-emphasis/de-emphasis topology. The input is pre-emphasized by over 15 dB. The pre-emphasized data goes into the delay lines. When you switch to a different type with no de-emphasis, which is most of the types, you are getting pre-emphasized echoes out which will sound louder and brighter for a brief moment.
* '''Plex Delay'''
 
* '''Pitch'''
 
  
[[Owners_Manuals|More information in the Owner's Manual]]
+
The fix is to use two delay blocks and switch between them.
 +
</blockquote>
 +
</blockquote>
  
 
==True Tape Echo==
 
==True Tape Echo==
Line 77: Line 111:
 
The Tape Echo mode type is an authentic model which works in mono. It's based on a different algorithm than the Stereo Tape Delay.
 
The Tape Echo mode type is an authentic model which works in mono. It's based on a different algorithm than the Stereo Tape Delay.
  
<blockquote>Release notes: "Added Tape Echo algorithm to Delay and Multidelay blocks. This algorithm simulates a tape echo where modulation occurs due to tape speed variation. In the Delay block the algorithm is implemented as a two head monophonic tape “deck”. The Time/Tempo parameters set the distance between the record and first playback head. The Ratio parameter sets the relative distance between the record and second playback head as a percentage of the first playback head. The Multidelay block is implemented as a monophonic deck with four independent heads. See the updated manual for full details."</blockquote>
+
Firmware release notes:
 +
 
 +
<blockquote><HR><blockquote>
 +
Added Tape Echo algorithm to Delay and Multidelay blocks. This algorithm simulates a tape echo where modulation occurs due to tape speed variation. In the Delay block the algorithm is implemented as a two head monophonic tape “deck”. The Time/Tempo parameters set the distance between the record and first playback head. The Ratio parameter sets the relative distance between the record and second playback head as a percentage of the first playback head. The Multidelay block is implemented as a monophonic deck with four independent heads. See the updated manual for full details.
 +
</blockquote></blockquote>
 +
 
 +
<blockquote>'''FRACTAL AUDIO QUOTES'''<HR>
 +
<blockquote>
 +
[http://forum.fractalaudio.com/posts/592160]
 +
The algorithm is a single tape with one record head and two playback heads. The signal from each head can be fed back (Feedback) and panned and leveled.
  
<blockquote>"The algorithm is a single tape with one record head and two playback heads. The signal from each head can be fed back (Feedback) and panned and leveled. Head 1 Time sets the delay time of head #1 when the Motor Speed is 1.0. This is analogous to the distance between the record head and the playback head in a tape deck. As you increase the time you move the heads apart and vice-versa. Whatever the time is set to is the delay time when the Motor Speed is 1.0. As you increase the Motor Speed the tape moves faster so the delay time decreases and vice-versa. The relative position of the heads do not change. Ratio sets the delay time of head #2 as a percentage of head #1. If you set Ratio to 50% then the delay time of head #2 will be half that of head #1. This is analogous to positioning head #2 exactly half the distance as head #1 from the record head. In brief: Delay Time = distance between heads, Motor Speed = tape speed. The LFOs modulate the motor speed. Modulating the motor speed (which changes the tape speed) is a very different effect than modulating the delay time. You can hear the difference between by varying the Motor Speed manually and the Head 1 Time manually. In a typical tape deck the tape speed is not constant. In the days of tape recorders much effort was expended on trying to keep the tape speed as constant as possible. This included periodic maintenance. However, when applied as a delay effect, the variation in tape speed could create a desirable modulation. Tape Echos, in particular, were built to cost points and suffered from considerable tape speed fluctuation. The two primary components of speed variation were termed "wow" and "flutter". Wow arises due to low-frequency variations in the tape speed. This is typically due to variation in the speed of the motor itself and/or eccentricity of the pulleys. Flutter is a high-frequency modulation and arises due to eccentricity of the capstan and pinch roller."  [http://forum.fractalaudio.com/posts/592160/ source]</blockquote>
+
Head 1 Time sets the delay time of head #1 when the Motor Speed is 1.0. This is analogous to the distance between the record head and the playback head in a tape deck. As you increase the time you move the heads apart and vice-versa. Whatever the time is set to is the delay time when the Motor Speed is 1.0.
  
<blockquote>"The LFOs actually modulate the tape speed. It’s the same as attaching a modifier to the tape speed. This is because in an actual tape deck the tape speed is what is typically subject to variation. Wow occurs due to variation in motor speed (or belt/pulley, etc.) and flutter is due to capstan and pinch roller. Wow varies the tape speed slowly, flutter is a high-frequency variation in speed. The actual delay time is very stable since the heads are stationary and the tape is taught between the heads. Delay modulation due to tape stretching is negligible."</blockquote>
+
As you increase the Motor Speed the tape moves faster so the delay time decreases and vice-versa. The relative position of the heads do not change.
  
<blockquote>"Originally all the delays "chirped" when changing the tempo (like many other effects processors). I rewrote the primary delay types so it cross-fades between tempos when you tap a new one to avoid this. The tape delay type doesn't do this so that you can use it as you would an actual tape delay and get all those cool effects by changing the head position or motor speed." [http://forum.fractalaudio.com/posts/936496/ source]</blockquote>
+
Ratio sets the delay time of head #2 as a percentage of head #1. If you set Ratio to 50% then the delay time of head #2 will be half that of head #1. This is analogous to positioning head #2 exactly half the distance as head #1 from the record head.
  
<blockquote>"The tools are already there for wow and flutter. Wow is modulation below 6 Hz. Flutter is above 6 Hz." "Wow is low frequency modulation. It occurs with records when the hole in the middle isn't perfectly centered or when the record has a warp or due to motor issues. It occurs with tape decks due to the tape being stretched or the motor not being regulated well. Flutter occurs in tape decks primarily due to the capstan being eccentric." [https://forum.fractalaudio.com/threads/a-few-wishes-about-delays.157274 source]</blockquote>
+
In brief: Delay Time = distance between heads, Motor Speed = tape speed.
  
<blockquote>"That algorithm does not support bit reduction." [http://forum.fractalaudio.com/threads/tape-delay-bit-reduction-not-working-and-delay-drive-question.101561/#post-1218097 source]</blockquote>
+
The LFOs modulate the motor speed. Modulating the motor speed (which changes the tape speed) is a very different effect than modulating the delay time. You can hear the difference between by varying the Motor Speed manually and the Head 1 Time manually.
 +
 
 +
In a typical tape deck the tape speed is not constant. In the days of tape recorders much effort was expended on trying to keep the tape speed as constant as possible. This included periodic maintenance. However, when applied as a delay effect, the variation in tape speed could create a desirable modulation. Tape Echos, in particular, were built to cost points and suffered from considerable tape speed fluctuation.
 +
 
 +
The two primary components of speed variation were termed "wow" and "flutter". Wow arises due to low-frequency variations in the tape speed. This is typically due to variation in the speed of the motor itself and/or eccentricity of the pulleys. Flutter is a high-frequency modulation and arises due to eccentricity of the capstan and pinch roller.
 +
</blockquote>
 +
 
 +
javajunkie attributed this to Cliff:<br>
 +
<blockquote>
 +
The LFOs actually modulate the tape speed. It’s the same as attaching a modifier to the tape speed.
 +
 
 +
This is because in an actual tape deck the tape speed is what is typically subject to variation. Wow occurs due to variation in motor speed (or belt/pulley, etc.) and flutter is due to capstan and pinch roller. Wow varies the tape speed slowly, flutter is a high-frequency variation in speed. The actual delay time is very stable since the heads are stationary and the tape is taught between the heads. Delay modulation due to tape stretching is negligible.
 +
</blockquote>
 +
 
 +
<blockquote>
 +
[http://forum.fractalaudio.com/posts/936496]
 +
[…]
 +
Originally all the delays "chirped" when changing the tempo (like many other effects processors). I rewrote the primary delay types so it cross-fades between tempos when you tap a new one to avoid this. The tape delay type doesn't do this so that you can use it as you would an actual tape delay and get all those cool effects by changing the head position or motor speed.
 +
</blockquote>
 +
 
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/a-few-wishes-about-delays.157274/post-1875476]
 +
The tools are already there for wow and flutter. Wow is modulation below 6 Hz. Flutter is above 6 Hz.<BR>
 +
Wow is low frequency modulation. It occurs with records when the hole in the middle isn't perfectly centered or when the record has a warp or due to motor issues. It occurs with tape decks due to the tape being stretched or the motor not being regulated well. Flutter occurs in tape decks primarily due to the capstan being eccentric.
 +
</blockquote>
 +
 
 +
<blockquote>
 +
[http://forum.fractalaudio.com/threads/tape-delay-bit-reduction-not-working-and-delay-drive-question.101561/#post-1218097]
 +
That algorithm does not support bit reduction.
 +
</blockquote>
 +
 
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/delay-block-lfo-3-add-motor-speed-as-destination-for-mono-tape-type.190283/post-2362000]
 +
LFO 1&2 modulate motor speed in that type.
 +
</blockquote>
 +
</blockquote>
 +
 
 +
The FM3 [[Factory presets|factory preset CLOUD DELAYS]] has three tape delays.
  
 
==Reverse delay==
 
==Reverse delay==
  
Also known as: backwards delay. It's a type in the Delay and Multi Delay blocks.
+
Also known as: backwards delay. It's a type in the Delay and the Multitap Delay blocks. You can also use Pitch Crystals or Multi Delay Plex Shift, with Pitch set to 0, and Direction set to: Reverse.
 +
 
 +
A little Diffusion, low Time value and increased Crossfade help to smear the initial attack points.
 +
 
 +
Set Feedback (number of repeats) to 0 for best results. To get multiple reverse-only repeats, send the wet signal through a separate forward delay. [http://forum.fractalaudio.com/threads/reverse-delay-problem.132367/#post-1566920]
  
Check out the Axe-Fx stock presets "Bass Ackwards" and "Regnalf Esrever".
+
Search the [[Factory presets]] page for <q>reverse</q> or <q>reversed</q>. Check out the presets <q>BASS ACKWARDS</q> and <q>REGNAL EREVER</q>.
  
You can also use Pitch Crystals or Multi Delay Plex Shift, with Pitch set to 0, and Direction set to: Reverse.
+
==2290 w/ Modulation==
 +
 
 +
The 2290/mod delay type has the Phase Reverse parameter set to Right. This will make the delays disappear entirely if the signal is summed to mono after the Delay block (for example when placed before the Amp, or when using a mono cab), due to phase cancellation.
 +
 
 +
<blockquote>'''FRACTAL AUDIO QUOTES'''<HR>
 +
<blockquote>
 +
[http://forum.fractalaudio.com/threads/question-for-cliff.138612/#post-1643914]
 +
The original 2290 was a “bit slice” processor. The sample rate was necessarily high because it was a one-bit converter.
 +
</blockquote>
 +
</blockquote>
 +
 
 +
=Delay block position on the grid=
 +
 
 +
Just like in analog rigs, there's a difference between the delay effect positioned before the amp and after the amp, especially when using distorted amp tones. It's up to you. Most people place a delay after the Amp block, but delay-before-amp certainly has its own charm.
 +
 
 +
; Before the Amp block : This will distort the delay trails and make them louder because of compression.
 +
 
 +
; After the Amp block : This results in cleaner-sounding delays.
 +
 
 +
<blockquote>
 +
'''FRACTAL AUDIO QUOTES'''
 +
<HR>
 +
 
 +
<blockquote>
 +
[http://forum.fractalaudio.com/threads/ax-8-firmware-version-10-00.141474/page-6#post-1677316]
 +
Sounds like you have the delay before the amp. This is normal behavior when putting a delay before a distorted (and therefore compressing) amp.
 +
</blockquote>
  
A little Diffusion, low Time value and increased Crossfade help to smear the initial attack points.
 
  
Set Feedback (number of repeats) to 0 for best results. To get multiple reverse-only repeats, send the wet signal through a separate forward delay. [http://forum.fractalaudio.com/threads/reverse-delay-problem.132367/#post-1566920 source]
+
Regarding the position of the Delay block relative to the Reverb block:
 +
<blockquote>
 +
[http://forum.fractalaudio.com/threads/delay-before-reverb-or-reverb-before-delay-whats-your-preference.57690/page-2#post-723087]
 +
If there isn't distortion or modulation in the delay/reverb then the order is irrelevant since they are then Linear Time Invariant (or shift invariant in digital parlance). If there is a small amount of distortion or modulation then the order is probably still irrelevant. If there is a lot of distortion or modulation then the order may make a difference. However, typically the biggest difference, as noted above, is series vs. parallel since h1(t)*h2(t) is not the same as h1(t)+h2(t). If LTI h1*h2 = h2*h1. It may seem counter-intuitive that the order doesn't matter but try it and you'll be surprised.
 +
</blockquote>
 +
</blockquote>
  
==2290==
+
Read <q>[[Presets#PRE_and_POST_routing|PRE and POST routing]]</q> for more information.
  
The 2290/mod delay type has the Phase Reverse parameter set to Right. This will make the delays disappear entirely if the signal is summed to mono after the Delay block (for example when placed before the Amp, or when using a mono cab), due to [[Mono versus stereo|phase cancellation]].
+
=CPU usage=
  
<blockquote>"The original 2290 was a “bit slice” processor. The sample rate was necessarily high because it was a one-bit converter." [http://forum.fractalaudio.com/threads/question-for-cliff.138612/#post-1643914 source] </blockquote>
+
Some Delay types, such as Tape and Ambient, require more CPU than other types.
  
=Parameters=
+
On the FM3, the Delay blocks share a core DSP with amp modeling. To avoid overloading that CPU, the Delay blocks on the FM3 do not support diffusion.
  
==Parameters table==
+
<blockquote>'''FRACTAL AUDIO QUOTES'''<HR>
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/fm3-firmware-1-06-public-beta-3.165144/post-1981139]
 +
We had to make a management decision. Under certain circumstances (using an Amp block and two Delay blocks with Diffusion on) the second DSP could get overloaded. The easiest solution at this time was to remove the Diffusion parameter. If we are able to improve the code efficiency we will reinstate the parameter. You have to realize the FM3 has only about 1/5 the DSP power of an Axe-Fx III. Trying to fit all those goodies in there while not sacrificing audio quality is a balancing act. I ALWAYS insist on quality over quantity. That's what differentiates our products. It takes a LOT of horsepower to do it right.
 +
</blockquote>
 +
</blockquote>
  
{| class="wikitable"
+
On the FM9, the two Delay blocks run in a dedicated DSP core, without much of an impact on the the overall CPU usage.
|-
 
! '''Parameter'''
 
! '''Axe-Fx III / FM3'''
 
! '''Axe-Fx II'''
 
! '''AX8 / FX8'''
 
|-
 
| Type
 
! yes
 
!
 
!
 
|-
 
| '''CONFIG'''
 
!
 
!
 
!
 
|-
 
| Time
 
! yes
 
!
 
!
 
|-
 
| Time Left, Time Right
 
! yes
 
!
 
!
 
|-
 
| Tempo
 
! yes
 
!
 
!
 
|-
 
| L/R Time Ratio
 
! yes
 
!
 
!
 
|-
 
| Spread (Width)
 
! yes
 
!
 
!
 
|-
 
| Master Feedback
 
! yes
 
!
 
!
 
|-
 
| Feedback
 
! yes
 
!
 
!
 
|-
 
| Feedback L<>R
 
! yes
 
!
 
!
 
|-
 
| Feedback Left, Feedback Right
 
! yes
 
!
 
!
 
|-
 
| Echo Pan
 
! yes
 
!
 
!
 
|-
 
| Motor Speed
 
! yes
 
!
 
!
 
|-
 
| Head 1 Time / Head 1 Tempo / Head 1 Ratio
 
! yes
 
!
 
!
 
|-
 
| Level 1/2, Feedback 1/2, Pan 1/2
 
! yes
 
!
 
!
 
|-
 
| Level L/R, Feedback L/R, Pan L/R
 
! yes
 
!
 
!
 
|-
 
| Repeat Stack/Hold
 
! yes
 
!
 
!
 
|-
 
| Drive
 
! yes
 
!
 
!
 
|-
 
| Bit Reduction
 
! yes
 
!
 
!
 
|-
 
| Right Post Delay
 
! yes
 
!
 
!
 
|-
 
| '''REVERSE'''
 
!
 
!
 
!
 
|-
 
| Run
 
! yes
 
!
 
!
 
|-
 
| Trigger Restart
 
! yes
 
!
 
!
 
|-
 
| Crossfade Time
 
! yes
 
!
 
!
 
|-
 
| '''SWEEP'''
 
!
 
!
 
!
 
|-
 
| Start Freq, Stop Freq
 
! yes
 
!
 
!
 
|-
 
| Resonance
 
! yes
 
!
 
!
 
|-
 
| Sweep Type / Rate / Tempo / Phase
 
! yes
 
!
 
!
 
|-
 
| '''EQ'''
 
!
 
!
 
!
 
|-
 
|  Low Cut, High Cut, Low Cut Slope, High Cut Slope, Q
 
! yes
 
!
 
!
 
|-
 
| Freq 1, Q1, Gain 1 / Freq 2, Q2, Gain 2
 
! yes
 
!
 
!
 
|-
 
| '''MODULATION'''
 
!
 
!
 
!
 
|-
 
| LFO Depth Range
 
! yes
 
!
 
!
 
|-
 
| LFO1 Type / Target / Rate / Tempo / Depth / Phase
 
! yes
 
!
 
!
 
|-
 
| LFO2 Type / Target / Rate / Tempo / Depth / Phase
 
! yes
 
!
 
!
 
|-
 
| Ducker Attenuation / Threshold / Release
 
! yes
 
!
 
!
 
|-
 
| Diffusion, Diffusion Time
 
! yes
 
!
 
!
 
|-
 
| Phase Reverse
 
! yes
 
!
 
!
 
|-
 
| '''MIX'''
 
!
 
!
 
!
 
|-
 
| Input Gain
 
! yes
 
!
 
!
 
|-
 
| Global Mix
 
! yes
 
!
 
!
 
|}
 
  
==Mix==
+
But features added to the Delay and Reverb effects can overtax the effects’ processor in extreme use situations. Therefore, when viewing a Delay or Reverb effect editing GUI screen on the FM9 hardware, a CPU meter will appear on the display if the cpu usage moves past 75%. As with the primary effects core, the recommended maximum cpu use value is 80% to ensure best performance.
  
Adjusting the Mix parameter has no impact on the dry signal, unless it goes beyond 50%. This only applies to the Delay block. It's referred to as the 'Mix Law' for the Delay block.
+
=Spillover=
  
<blockquote>(firmware 11 for Axe-Fx II) "Changed mix law for Delay block. The dry signal now stays constant at unity until Mix reaches 50% then decreases linearly to zero. Conversely the wet signal starts at zero and then increases linearly to unity when Mix reaches 50%. This eliminates having to compensate for decreased dry signal when increasing the mix".</blockquote>
+
Read this: [[Spillover]]
  
The Mix Law makes it unnecessary to use Delay in [[Presets#Series_and_parallel_routing|parallel routing]].
+
=Parameters=
  
==Config==
+
==Mix==
  
Config is the critical parameter in terms of specifying the base algorithm.
+
Adjusting the Mix parameter has no impact on the dry signal, unless it goes beyond 50%. This only applies to the Delay block. It's referred to as the Mix Law for the Delay block.
  
<blockquote>"The Config parameter selects the base algorithm. The Type parameter selects the default parameters. If you selected the Deluxe Memman type and then changed the Config to dual you got the dual delay algorithm with the Memman default values." [http://forum.fractalaudio.com/threads/dual-delay-option-for-dlx-memory-man.136762/#post-1620981 source] </blockquote>
+
<blockquote>
 +
'''FRACTAL AUDIO QUOTES'''
 +
<HR>
  
This parameter has been removed in firmware Ares, except in delay types where it changes a type between mono and stereo operation.
+
<blockquote>
 +
[https://forum.fractalaudio.com/threads/axe-fx-ii-firmware-11-released.73988/post-905926]
 +
[…]
 +
Changed mix law for Delay block. The dry signal now stays constant at unity until Mix reaches 50% then decreases linearly to zero. Conversely the wet signal starts at zero and then increases linearly to unity when Mix reaches 50%. This eliminates having to compensate for decreased dry signal when increasing the mix.
 +
</blockquote>
 +
</blockquote>
  
 
==Time and Tempo==
 
==Time and Tempo==
  
 
There are two ways to set the delay time:
 
There are two ways to set the delay time:
* enter a specific delay time in milliseconds
+
* Enter a specific delay time in milliseconds, or
* set the tempo in relation to the global preset tempo (Tempo button), say 1/8, 1/8 Dot, etc
+
* Set the tempo in relation to the global preset tempo (Tempo button), say 1/8, 1/8 Dot, etc.
  
 
Important: if you use the Tempo method, the menu won't let you enter a delay time in milliseconds anymore. To do that, first set Tempo to None.
 
Important: if you use the Tempo method, the menu won't let you enter a delay time in milliseconds anymore. To do that, first set Tempo to None.
 +
 +
Maximum delay time is 16 seconds on the Axe-Fx III and FM9, and 8 seconds on the FM3.
  
 
==EQ==
 
==EQ==
Line 352: Line 269:
 
The Delay block contains a parametric EQ for the wet signal. Low cut and high cut have adjustable slopes. The EQ stuff is on a separate GUI page with a graphical display.
 
The Delay block contains a parametric EQ for the wet signal. Low cut and high cut have adjustable slopes. The EQ stuff is on a separate GUI page with a graphical display.
  
[http://forum.fractalaudio.com/axe-fx-ii-discussion/81089-analogue-delay-tutorial.html Setting up an analog sounding delay]
+
[https://forum.fractalaudio.com/threads/how-to-simulate-analog-delays-whose-filter-or-tone-stack-applies-to-repeats-additively.200075/#post-2494636 Forum discussion about EQ-ing repeats]
 +
 
 +
<blockquote>'''FRACTAL AUDIO QUOTES'''<HR>
 +
<blockquote>
 +
[http://forum.fractalaudio.com/threads/helix-and-the-law-of-unintended-consequences.106169/page-3#post-1273176]
 +
IMO, what people like about analog delays are the narrow bandwidth. The noise, aliasing and crud is debatable. The early analog delays typically used fixed anti-aliasing and reconstruction filters. These filters were designed for the worst-case scenario: maximum delay time. Typically at maximum delay time the clock frequency was only 4-5 kHz IIRC which means the filters need to be < 2 kHz. One popular pedal had the filter at 1.75 kHz. They filters also have a very steep cut-off, typically at least 4th-order but usually 6th order. The slope is given by order x 6 so for 6th-order you would set the slope to 36 dB/oct. For those who are interested there's a paper on DAFX about it.
 +
</blockquote>
 +
</blockquote>
  
<blockquote>"IMO, what people like about analog delays are the narrow bandwidth. The noise, aliasing and crud is debatable. The early analog delays typically used fixed anti-aliasing and reconstruction filters. These filters were designed for the worst-case scenario: maximum delay time. Typically at maximum delay time the clock frequency was only 4-5 kHz IIRC which means the filters need to be < 2 kHz. One popular pedal had the filter at 1.75 kHz. They filters also have a very steep cut-off, typically at least 4th-order but usually 6th order. The slope is given by order x 6 so for 6th-order you would set the slope to 36 dB/oct. For those who are interested there's a paper on DAFX about it." [http://forum.fractalaudio.com/threads/helix-and-the-law-of-unintended-consequences.106169/page-3#post-1273176 source]</blockquote>
+
[[image:slope.gif|400px]]
  
 
==L/R Time Ratio==
 
==L/R Time Ratio==
  
A trick is to set this at 61,8, with is also known as The Golden Ratio.
+
Tip: Try 61.8, which is also known as: The Golden Ratio.
  
Read this:
+
For more information see Wikipedia's <q>[https://en.wikipedia.org/wiki/Golden_ratio Golden ratio]</q> article or watch Leon Todd's video below.
* [https://en.wikipedia.org/wiki/Golden_ratio Wikipedia]
 
* [https://www.youtube.com/watch?v=inCMJxHgfak Leon Todd's tutorial]
 
  
 
==Drive==
 
==Drive==
  
The Drive parameter allows adding distortion to the echoes when using the block before an Amp block.
+
The Drive parameter determines the amount of distortion added to the echoes.
  
<blockquote>"Some blocks have clipping simulation, the delay blocks among others. This simulates the input of the delay line being overdriven (like a real analog delay). It also prevents runaway if the feedback is >= 100%." [http://forum.fractalaudio.com/threads/eq-after-a-volume-pedal-does-resolution-decrease.143891/#post-1702958 source]</blockquote>
+
Turning up Drive will decrease the level of the repeats.
  
Turning up Drive will decrease the level of the repeats.
+
<blockquote>'''FRACTAL AUDIO QUOTES'''<HR>
 +
<blockquote>
 +
[http://forum.fractalaudio.com/threads/eq-after-a-volume-pedal-does-resolution-decrease.143891/#post-1702958]
 +
Some blocks have clipping simulation, the delay blocks among others. This simulates the input of the delay line being overdriven (like a real analog delay). It also prevents runaway if the feedback is >= 100%.  
  
<blockquote>"If it didn't do that the repeats would get louder until they started clipping." [http://forum.fractalaudio.com/threads/delay-volume-and-drive-interaction.132339/#post-1566723 source]</blockquote>
+
If it didn't do that the repeats would get louder until they started clipping.
 +
</blockquote>
 +
</blockquote>
  
 
==Time Offset==
 
==Time Offset==
  
The Time Offset parameter (Mono Delay only) allows adding up to 100ms of delay to the right wet signal which can be used for widening effects.
+
The Time Offset parameter (Mono Delay only) allows adding up to 100ms of delay to the right wet signal, which can be used for widening effects.
  
==Hold/Stack==
+
==Stack/Hold==
  
 
When Hold is activated, the wet input to the block is muted and feedback is set to infinity. This can be used to achieve pad sounds and drone notes/chords.
 
When Hold is activated, the wet input to the block is muted and feedback is set to infinity. This can be used to achieve pad sounds and drone notes/chords.
  
Hold can be controlled with an external controller.
+
Hold can be controlled with an [[External controller]].
  
 
Note: if the Delay is placed in a parallel row with Mix at 100%, an external controller is attached to both Bypass and Hold, and Bypass Mode is set to Mute In, then the Hold function won't work. Solve this by changing Bypass Mode to Mute Out.
 
Note: if the Delay is placed in a parallel row with Mix at 100%, an external controller is attached to both Bypass and Hold, and Bypass Mode is set to Mute In, then the Hold function won't work. Solve this by changing Bypass Mode to Mute Out.
  
Firmware Ares 12 added the "Stack" feature:
+
When attaching a pedal to Off/Stack/Hold, Heel is Off, Stack is middle and Toe is Hold.
 +
 
 +
<blockquote>
 +
'''FRACTAL AUDIO QUOTES'''
 +
<HR>
 +
 
 +
Firmware Ares 12 added the Stack feature:
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/axe-fx-iii-firmware-version-12-00-public-beta-2-beta-3.157788/post-1881584]
 +
[…]
 +
Added Stack/Hold parameter to Plex Delay and Plex Verb types in the Plex block. When set to STACK incoming audio is stacked on existing audio and held. When set to HOLD existing audio is held.
 +
</blockquote>
 +
 
 +
 
 +
Firmware Cygnus v16.02:
 +
<blockquote>
 +
[…]
 +
[https://forum.fractalaudio.com/threads/axe-fx-iii-firmware-release-version-16-02.173356/]
 +
Improved Delay block so repeats do not degrade when Hold is activated.
 +
</blockquote>
 +
 
  
<blockquote>"Added Stack/Hold parameter to Plex Delay and Plex Verb types in the Plex block. When set to STACK incoming audio is stacked on existing audio and held. When set to HOLD existing audio is held."</blockquote>
+
Repeats degrade using Hold on the FM3:
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/delay-infinite-repeat-degradation-over-time.175833/post-2134169]
 +
The FM3 is not an Axe-Fx III. To implement this in the FM3 would increase CPU usage which is not worth the trade-off.
 +
</blockquote>
 +
 
 +
 
 +
Firmware 24.00:
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/axe-fx-iii-firmware-24-00-public-beta-2.200302/]
 +
[…]
 +
Improved Stack/Hold behavior in Delay block. Note that if the Compander is enabled Stack/Hold is not available and will be disabled.
 +
</blockquote>
 +
 
 +
 
 +
Firmware 24.01:
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/axe-fx-iii-firmware-24-01-release.200427/]
 +
[…]
 +
* In Hold mode repeats are now infinite (or nearly, may degrade over many minutes/hours).
 +
* Added Stack Feedback and Hold Feedback parameters. This allows adjusting the decay time independently for the stack and hold modes.
 +
* Improved transition between Stack/Hold states.
 +
 
 +
Note that if the Compander is enabled and/or Bit Reduction is greater than zero that the echoes will degrade over time. If you want infinite repeats then Compander must be OFF and Bit Reduction set to zero. Infinite repeats are also not available in the Tape types as the tape algorithm is inherently lossy (like a real tape).
 +
</blockquote>
 +
</blockquote>
  
 
==Ducking==
 
==Ducking==
  
<blockquote>"To gain basic understanding try extreme settings in an experiment. Start with a "hot" delay mix of about 50%. The first way you might do this is to set DUCKER ATTENUATION to 80 dB and then adjust the DUCKER THRESHOLD, from the top down—starting at 0.0 and lowering it to hear how ducking kicks in. This will teach you where your threshold is most dynamic. Another good experiment is to set the THRESHOLD all the way down to -80dB and then increase the DUCKER ATTENUATION from 0-dB upwards. This helps you understand what a reduction of "X" dB sounds like. Once you have extreme ducking dialed in, you can play with RELEASE to see how it works. After this, you should be able to set all three controls so they suit your needs." [http://forum.fractalaudio.com/threads/a-good-settings-for-ducking-the-delay.128584/#post-1527009 source]</blockquote>
+
<blockquote>'''FRACTAL AUDIO QUOTES'''<HR>
 +
<blockquote>
 +
[http://forum.fractalaudio.com/threads/a-good-settings-for-ducking-the-delay.128584/#post-1527009]
 +
To gain basic understanding try extreme settings in an experiment. Start with a "hot" delay mix of about 50%.
 +
 
 +
The first way you might do this is to set DUCKER ATTENUATION to 80 dB and then adjust the DUCKER THRESHOLD, from the top down—starting at 0.0 and lowering it to hear how ducking kicks in. This will teach you where your threshold is most dynamic.
 +
 
 +
Another good experiment is to set the THRESHOLD all the way down to -80dB and then increase the DUCKER ATTENUATION from 0-dB upwards. This helps you understand what a reduction of "X" dB sounds like.
 +
 
 +
Once you have extreme ducking dialed in, you can play with RELEASE to see how it works.
 +
 
 +
After this, you should be able to set all three controls so they suit your needs.
 +
</blockquote>
 +
</blockquote>
  
 
==Master Feedback==
 
==Master Feedback==
Line 398: Line 383:
 
This goes up to 200% to create oscillating delay effects.
 
This goes up to 200% to create oscillating delay effects.
  
[http://axechange.fractalaudio.com/detail.php?preset=3959 Self-oscillating preset by Admin M@]
+
==Diffusion==
 +
 
 +
Increasing Diffusion smears the separate delay trails, creating a reverb-like effect. It increases CPU usage a little.
 +
 
 +
Diffusion has its own LFO modulation parameters, demonstrated by the Zephyr delay type.
 +
 
 +
The Delay blocks on the FM3 do not have Diffusion parameters to save CPU usage (they share a DSP with amp modeling). This means that certain delay types are not available on the FM3.
 +
 
 +
<blockquote>
 +
'''FRACTAL AUDIO QUOTES'''
 +
<HR>
 +
 
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/fm3-firmware-1-06-public-beta-3.165144/post-1981139]
 +
We had to make a management decision. Under certain circumstances (using an Amp block and two Delay blocks with Diffusion on) the second DSP could get overloaded. The easiest solution at this time was to remove the Diffusion parameter. If we are able to improve the code efficiency we will reinstate the parameter. You have to realize the FM3 has only about 1/5 the DSP power of an Axe-Fx III. Trying to fit all those goodies in there while not sacrificing audio quality is a balancing act. I ALWAYS insist on quality over quantity. That's what differentiates our products. It takes a LOT of horsepower to do it right.
 +
</blockquote>
 +
 
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/lexicon-pcm70-pan-circular-delays-tc1210-chorus.164461/post-1974193] Dug my PCM70 out of the closet and compared the diffusion to the Axe-Fx III. The Axe-Fx III is vastly superior. The PCM70 sounds metallic and comb-filtered. The Axe-Fx III sounds like a little reverb is added to each delay.
 +
</blockquote>
 +
 
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/lexicon-pcm70-pan-circular-delays-tc1210-chorus.164461/post-1974350]
 +
I designed the Axe-Fx diffusers to sound like little reverbs. I like a little, 10-20%, which makes the echoes slowly turn into a wash. To me the PCM70 goes "brzzzzpppp" on the attack which I don't find pleasant at all. I've experimented with diffusers for years. I hate all the examples in the literature (i.e. Schroeder allpass sections). I've implemented quite a few out of the papers and they all sound like crap IMO. I tried the allpass cascade in the JCRev algorithm again today and, yup, still sounds as bad as I remember.
 +
</blockquote>
 +
</blockquote>
 +
 
 +
==Compander==
 +
 
 +
Current Axe-Fx III, FM9 and FM3 firmware provides virtual companders in the Delay blocks. A compander compresses the signal at the input and decompresses it again (expands) at the output. This results in better SNR ratios.
 +
 
 +
Disabling the compander saves CPU.
 +
 
 +
Because of the compression due to the compander, spillover is affected.
 +
 
 +
If the Compander is enabled, Stack/Hold is not available.
 +
 
 +
<blockquote>'''FRACTAL AUDIO QUOTES'''<HR>
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/axe-fx-iii-firmware-release-version-16-03.174033/post-2109538]
 +
A Compander is a compressor followed by an expander. If the time constant of the compressor and expander are the same (and the "channel" is perfect, i.e. linear and lossless) then a Compander is transparent. If you change the time constant of one vs. the other the transients will become distorted.
 +
 
 +
The "Transients" knob controls the time constant mismatch. Negative values smooth the transients, positive values enhance the transients.
 +
 
 +
A Compander with transient enhancement can be used on kick drums, bass, etc. to add punch. Transient reduction can be used to reduce plosives.
 +
 
 +
For guitar you can use the Compander to add or remove pick attack.
 +
</blockquote>
 +
 
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/delay-block-update.173708/post-2104201]
 +
[…]
 +
The first step in adding compansion to the delay block was creating a compander algorithm. So I created a Compander type first in the Compressor block.
 +
 
 +
Once that was working I used that algorithm in the Delay block. The Compander allows you to set the Ratio, Time, Transients and Level. Turn Transients down and the attack is reduced, turn it up and the attack is enhanced. You can use it with kick drum to enhance the punch, put it on vocals to reduce plosives, etc.
 +
</blockquote>
 +
 
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/axe-fx-iii-firmware-release-version-16-04.174104/post-2114216]
 +
The DMM, DM2, and Carbon Copy have it on by default.
 +
</blockquote>
 +
 
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/axe-fx-iii-firmware-release-version-16-04.174104/post-2111588]
 +
[…]
 +
The HIGHER the compander threshold the more prominent the effect. It's the threshold that makes the compander do what it does. An ideal compander would have a threshold of negative infinity dB. A real compander suffers from a finite detection threshold which is what causes the softening of the transients.
 +
 
 +
The ubiquitous NE570/SA571 has a threshold of about -60 dB so that's the default.
 +
</blockquote>
 +
 
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/axe-fx-iii-firmware-23-04-release.199875/page-9#post-2492262]
 +
That's unavoidable without losing spillover. When the compander is active the data is compressed before being written to the delay line and decompressed when being read. So if you switch from not using the compander to using the compander uncompressed data is expanded which makes it louder.
 +
</blockquote>
 +
</blockquote>
 +
 
 +
==Config (legacy)==
 +
 
 +
This parameter has been removed in firmware Ares and later.
 +
 
 +
<blockquote>
 +
'''PREVIOUS GENERATIONS'''
 +
<HR>
 +
 
 +
<blockquote>
 +
[http://forum.fractalaudio.com/threads/dual-delay-option-for-dlx-memory-man.136762/#post-1620981]
 +
The Config parameter selects the base algorithm. The Type parameter selects the default parameters. If you selected the Deluxe Memman type and then changed the Config to dual you got the dual delay algorithm with the Memman default values.
 +
</blockquote>
 +
</blockquote>
 +
 
 +
=Tips, tricks and troubleshooting=
 +
 
 +
==Factory presets==
 +
 
 +
The Delay block is showcased in many factory presets. Search the [[Factory presets]] page for "delay".
  
==Diffusion==
+
==Change pitch when adjusting delay time==
 +
 
 +
Only the Mono Tape delay type changes the pitch of the delay trails when adjusting the delay time.
  
Increasing Diffusion smears the separate delay trails, creating a reverb-like effect.
+
To force other types to same behavior, attach a modifier to the Delay Time parameter.
  
Using Diffusion will increase CPU usage a little.
+
<blockquote>'''FRACTAL AUDIO QUOTES'''<HR>
 +
<blockquote>
 +
[https://www.thegearpage.net/board/index.php?threads/fractal-delays.2260423/post-32668710]
 +
[…]
 +
The original algorithm simply slid to the new time which would cause pitch shift. People complained vociferously since tapping in a new tempo would cause a pitch glitch. The new algorithm does not do this. It treats time/tempo changes as "requests" and cross-fades between two delays running simultaneously.
  
=Tips and tricks=
+
If you want pitch shift the use the Mono Tape type. There are other ways as well but I'm not at my desk now so I forget the details. I believe if you attach a modifier to the Time parameter in the other types it will pitch shift when you change the time. I seem to remember I made it so you could do the pitch shift thing with a modifier but not when tapping in a tempo or setting the time by hand. I.e., you can do the Eruption dive-bomb by attaching an expression pedal to the Time parameter.
 +
</blockquote>
 +
</blockquote>
  
 
==Prevent cutting off tails when using a pedal==
 
==Prevent cutting off tails when using a pedal==
  
By attaching an external controller (connected to a pedal or switch) to Input Gain, you're controlling the delay level at the input stage. This will make delay trails fade out nicely when muting the delay.
+
By attaching an external controller (connected to a pedal or switch) to the Input Gain parameter, you're controlling the delay level at the input stage. This will make delay trails fade out nicely when muting the delay.
  
==Ping-Pong: tool for testing stereo output==
+
==Use Ping-Pong delay to test stereo output ==
  
The Ping Pong type lends itself well for checking the stereo output of the unit.
+
The Ping Pong delay type lends itself well for checking the stereo output of the unit. The first repeat should be heard at the LEFT side.
  
==Delay settings for leads==
+
==Delay settings for lead guitar==
  
 
For a lead tone with ambient delay, try this: Stereo Delay, Tempo 1/4, Right Time Ratio 61.8%. You can use these settings with a stereo or mono rig.
 
For a lead tone with ambient delay, try this: Stereo Delay, Tempo 1/4, Right Time Ratio 61.8%. You can use these settings with a stereo or mono rig.
Line 422: Line 509:
 
==Fixed number of repeats==
 
==Fixed number of repeats==
  
If you need an exact number of repeats, use the Band Delay or Tap Ten Delay in the [[Multi Delay block]].
+
If you need an exact number of repeats, use the Band Delay type or Tap Ten Delay type in the [[Multitap Delay block]].
 +
 
 +
==Micro-Delay==
 +
 
 +
The delay can be set to create a micro-delay for enhanced stereo separation.
 +
 
 +
<blockquote>'''FRACTAL AUDIO QUOTES'''<HR>
 +
<blockquote>
 +
[https://forum.fractalaudio.com/threads/30-ms-delay-but-nothing-else.75709/#post-924932]
 +
Another way would be to use the Delay block. Set the Mix to 100%, dial in the desired amount of delay and set Balance to full right.
 +
</blockquote>
 +
</blockquote>
 +
 
 +
Or use the [[Enhancer block]] instead.
  
 
==Effect on delay trails only==
 
==Effect on delay trails only==
Line 434: Line 534:
 
If the parameter Auto Delay in the Tempo menu is set to “ON,” any delay blocks that are bypassed will become active whenever a tempo is tapped in. This allows you to set the tempo and un-bypass your delay block(s) from a single footswitch. Read this: [[Tempo]]
 
If the parameter Auto Delay in the Tempo menu is set to “ON,” any delay blocks that are bypassed will become active whenever a tempo is tapped in. This allows you to set the tempo and un-bypass your delay block(s) from a single footswitch. Read this: [[Tempo]]
  
=More information=
+
==Rack effects processors from the 80s==
 +
 
 +
Watch Leon Todd's video below for recreations of various rack effects processors from the 80s, including SPX90, 2290, PCM780 and H3000.
 +
 
 +
==Turn the reverb into a delay==
 +
 
 +
Firmware 20 for the Axe-Fx III added the ability to use Pre-Delay in the Reverb block as a simple echo. Pre-Delay provides Tempo, Feedback and Mix parameters. The pre-delay time has also been increased to 1s. Several Reverb types demonstrate the capabilities: Echo Plate, Echo Hall, Echo Room.
 +
 
 +
==More information==
 +
 
 +
* Well-known guitar players share their delay blocks as part of Fractal Audio's <q>[https://www.fractalaudio.com/gift-of-tone/ Gift of Tone series]</q>
 +
* Forum member and effects wizard Simeon Harris provides magnificent [http://www.simeonharris.co.uk delay effects]
 +
* Guitar Player: <q>[https://www.guitarplayer.com/lessons/how-to-get-the-most-out-of-your-delay-pedal How To get The Most Out Of Your Delay Pedal]</q>
 +
* Premier Guitar: <q>[http://www.premierguitar.com/articles/25035-behind-the-bucket-brigade?utm_source=Sailthru&utm_medium=email&utm_campaign=Gruhn%20ENL%20-%20032217&utm_term=PG%20Weekly Behind the Bucket Brigade]</q>
  
* [http://forum.fractalaudio.com/axe-fx-ii-discussion/100655-50-delay-blocks-15-presets-available-v19.html forum member and effects wizard Simeon provides a load of magnificent delay effects]
+
=Videos=
* [http://forum.fractalaudio.com/axe-fx-ii-discussion/75943-tutorial-dialing-up-my-delay-fractal-audio-axe-fx-ii.html Scott Peterson's tutorial]
 
* [http://www.premierguitar.com/articles/How_to_Get_the_Most_Out_of_Your_Delay_Pedal?page=3 Premier Guitar: How To get The Most Out Of Your Delay Pedal]
 
* [http://forum.fractalaudio.com/threads/axe-xl-and-jp-2c-boogie.116019 John Petrucci's delay settings]
 
* [http://www.premierguitar.com/articles/25035-behind-the-bucket-brigade?utm_source=Sailthru&utm_medium=email&utm_campaign=Gruhn%20ENL%20-%20032217&utm_term=PG%20Weekly Premier Guitar: Behind the Bucket Brigade]
 
* [http://forum.fractalaudio.com/threads/dual-delay-in-series.134019 Andy Timmons delay settings]
 
  
[[image:Delay block - Mono.PNG|375px]] [[image:Delay block - Mono Tape.PNG|350px]] [[image:Delay block - Stereo.PNG|400px]]
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Latest revision as of 19:16, 22 March 2024

Available on which products

  • Axe-Fx III: 4 blocks
  • FM3, FM9: 2 blocks
  • Axe-Fx II, FX8, AX8: 2 blocks

Channels or X/Y

  • Axe-Fx III, FM9, FM3: 4 channels
  • Axe-Fx II, FX8, AX8: X/Y

Delay block diagrams

Delay block - Mono.PNG

Delay block - Mono Tape.PNG

Delay block - Stereo.PNG

Dual Delay.png

Delay types

Firmware 17.01 and later:

  1. 2290 W/ Modulation
  2. Ambient Stereo
  3. Analog Mono
  4. Analog Stereo
  5. Deluxe Mind Guy
  6. Diffused Delay (not available on the FM3, because the FM3's Delay block doesn't support Diffusion)
  7. Digital Mono
  8. Digital Stereo
  9. DM-Two Delay
  10. Dual Delay
  11. Ducking Delay
  12. Graphite Copy Delay
  13. Lo-Fi Tape
  14. Mono BBD
  15. Mono Tape
  16. Pan Delay (Axe-Fx III only)
  17. Ping-Pong
  18. Reverse Delay
  19. Stereo BBD
  20. Stereo Mind Guy
  21. Stereo Tape
  22. Stereo Trem Delay (Axe-Fx III only)
  23. Sweep Delay
  24. Vintage Digital
  25. Wandering Delays (Axe-Fx III only)
  26. Worn Tape
  27. Zephyr: FAS original [1] (not available on the FM3, because the FM3's Delay block doesn't support Diffusion))
  28. Dual Head Tape Delay (added in firmware 23)

The following blocks are also capable of providing a delay effect:

Looper functionality (also a delay) is provided through the dedicated Looper block.

Additional information is in the Owner's Manual.

Deluxe Memory Guy

FRACTAL AUDIO QUOTES


[2] The model is matched to an original, not reissue, DMM.

Vintage Digital Delay

FRACTAL AUDIO QUOTES


[3] It uses virtual crappy converters with low bit depth.

[4] The whole point of the Vintage Digital type is the artifacts. It's modeling an early, primitive digital delay w/ an 8-bit converter.

[5] Just modeled it after how devices in that era worked.

DM-Two Delay

FRACTAL AUDIO QUOTES


[6] […] the DM-2 has a pre-emphasis/de-emphasis topology. The input is pre-emphasized by over 15 dB. The pre-emphasized data goes into the delay lines. When you switch to a different type with no de-emphasis, which is most of the types, you are getting pre-emphasized echoes out which will sound louder and brighter for a brief moment.

The fix is to use two delay blocks and switch between them.

True Tape Echo

The Tape Echo mode type is an authentic model which works in mono. It's based on a different algorithm than the Stereo Tape Delay.

Firmware release notes:


Added Tape Echo algorithm to Delay and Multidelay blocks. This algorithm simulates a tape echo where modulation occurs due to tape speed variation. In the Delay block the algorithm is implemented as a two head monophonic tape “deck”. The Time/Tempo parameters set the distance between the record and first playback head. The Ratio parameter sets the relative distance between the record and second playback head as a percentage of the first playback head. The Multidelay block is implemented as a monophonic deck with four independent heads. See the updated manual for full details.

FRACTAL AUDIO QUOTES


[7] The algorithm is a single tape with one record head and two playback heads. The signal from each head can be fed back (Feedback) and panned and leveled.

Head 1 Time sets the delay time of head #1 when the Motor Speed is 1.0. This is analogous to the distance between the record head and the playback head in a tape deck. As you increase the time you move the heads apart and vice-versa. Whatever the time is set to is the delay time when the Motor Speed is 1.0.

As you increase the Motor Speed the tape moves faster so the delay time decreases and vice-versa. The relative position of the heads do not change.

Ratio sets the delay time of head #2 as a percentage of head #1. If you set Ratio to 50% then the delay time of head #2 will be half that of head #1. This is analogous to positioning head #2 exactly half the distance as head #1 from the record head.

In brief: Delay Time = distance between heads, Motor Speed = tape speed.

The LFOs modulate the motor speed. Modulating the motor speed (which changes the tape speed) is a very different effect than modulating the delay time. You can hear the difference between by varying the Motor Speed manually and the Head 1 Time manually.

In a typical tape deck the tape speed is not constant. In the days of tape recorders much effort was expended on trying to keep the tape speed as constant as possible. This included periodic maintenance. However, when applied as a delay effect, the variation in tape speed could create a desirable modulation. Tape Echos, in particular, were built to cost points and suffered from considerable tape speed fluctuation.

The two primary components of speed variation were termed "wow" and "flutter". Wow arises due to low-frequency variations in the tape speed. This is typically due to variation in the speed of the motor itself and/or eccentricity of the pulleys. Flutter is a high-frequency modulation and arises due to eccentricity of the capstan and pinch roller.

javajunkie attributed this to Cliff:

The LFOs actually modulate the tape speed. It’s the same as attaching a modifier to the tape speed.

This is because in an actual tape deck the tape speed is what is typically subject to variation. Wow occurs due to variation in motor speed (or belt/pulley, etc.) and flutter is due to capstan and pinch roller. Wow varies the tape speed slowly, flutter is a high-frequency variation in speed. The actual delay time is very stable since the heads are stationary and the tape is taught between the heads. Delay modulation due to tape stretching is negligible.

[8] […] Originally all the delays "chirped" when changing the tempo (like many other effects processors). I rewrote the primary delay types so it cross-fades between tempos when you tap a new one to avoid this. The tape delay type doesn't do this so that you can use it as you would an actual tape delay and get all those cool effects by changing the head position or motor speed.

[9] The tools are already there for wow and flutter. Wow is modulation below 6 Hz. Flutter is above 6 Hz.
Wow is low frequency modulation. It occurs with records when the hole in the middle isn't perfectly centered or when the record has a warp or due to motor issues. It occurs with tape decks due to the tape being stretched or the motor not being regulated well. Flutter occurs in tape decks primarily due to the capstan being eccentric.

[10] That algorithm does not support bit reduction.

[11] LFO 1&2 modulate motor speed in that type.

The FM3 factory preset CLOUD DELAYS has three tape delays.

Reverse delay

Also known as: backwards delay. It's a type in the Delay and the Multitap Delay blocks. You can also use Pitch Crystals or Multi Delay Plex Shift, with Pitch set to 0, and Direction set to: Reverse.

A little Diffusion, low Time value and increased Crossfade help to smear the initial attack points.

Set Feedback (number of repeats) to 0 for best results. To get multiple reverse-only repeats, send the wet signal through a separate forward delay. [12]

Search the Factory presets page for reverse or reversed. Check out the presets BASS ACKWARDS and REGNAL EREVER.

2290 w/ Modulation

The 2290/mod delay type has the Phase Reverse parameter set to Right. This will make the delays disappear entirely if the signal is summed to mono after the Delay block (for example when placed before the Amp, or when using a mono cab), due to phase cancellation.

FRACTAL AUDIO QUOTES


[13] The original 2290 was a “bit slice” processor. The sample rate was necessarily high because it was a one-bit converter.

Delay block position on the grid

Just like in analog rigs, there's a difference between the delay effect positioned before the amp and after the amp, especially when using distorted amp tones. It's up to you. Most people place a delay after the Amp block, but delay-before-amp certainly has its own charm.

Before the Amp block 
 This will distort the delay trails and make them louder because of compression.
After the Amp block 
 This results in cleaner-sounding delays.

FRACTAL AUDIO QUOTES


[14] Sounds like you have the delay before the amp. This is normal behavior when putting a delay before a distorted (and therefore compressing) amp.


Regarding the position of the Delay block relative to the Reverb block:

[15] If there isn't distortion or modulation in the delay/reverb then the order is irrelevant since they are then Linear Time Invariant (or shift invariant in digital parlance). If there is a small amount of distortion or modulation then the order is probably still irrelevant. If there is a lot of distortion or modulation then the order may make a difference. However, typically the biggest difference, as noted above, is series vs. parallel since h1(t)*h2(t) is not the same as h1(t)+h2(t). If LTI h1*h2 = h2*h1. It may seem counter-intuitive that the order doesn't matter but try it and you'll be surprised.

Read PRE and POST routing for more information.

CPU usage

Some Delay types, such as Tape and Ambient, require more CPU than other types.

On the FM3, the Delay blocks share a core DSP with amp modeling. To avoid overloading that CPU, the Delay blocks on the FM3 do not support diffusion.

FRACTAL AUDIO QUOTES


[16] We had to make a management decision. Under certain circumstances (using an Amp block and two Delay blocks with Diffusion on) the second DSP could get overloaded. The easiest solution at this time was to remove the Diffusion parameter. If we are able to improve the code efficiency we will reinstate the parameter. You have to realize the FM3 has only about 1/5 the DSP power of an Axe-Fx III. Trying to fit all those goodies in there while not sacrificing audio quality is a balancing act. I ALWAYS insist on quality over quantity. That's what differentiates our products. It takes a LOT of horsepower to do it right.

On the FM9, the two Delay blocks run in a dedicated DSP core, without much of an impact on the the overall CPU usage.

But features added to the Delay and Reverb effects can overtax the effects’ processor in extreme use situations. Therefore, when viewing a Delay or Reverb effect editing GUI screen on the FM9 hardware, a CPU meter will appear on the display if the cpu usage moves past 75%. As with the primary effects core, the recommended maximum cpu use value is 80% to ensure best performance.

Spillover

Read this: Spillover

Parameters

Mix

Adjusting the Mix parameter has no impact on the dry signal, unless it goes beyond 50%. This only applies to the Delay block. It's referred to as the Mix Law for the Delay block.

FRACTAL AUDIO QUOTES


[17] […] Changed mix law for Delay block. The dry signal now stays constant at unity until Mix reaches 50% then decreases linearly to zero. Conversely the wet signal starts at zero and then increases linearly to unity when Mix reaches 50%. This eliminates having to compensate for decreased dry signal when increasing the mix.

Time and Tempo

There are two ways to set the delay time:

  • Enter a specific delay time in milliseconds, or
  • Set the tempo in relation to the global preset tempo (Tempo button), say 1/8, 1/8 Dot, etc.

Important: if you use the Tempo method, the menu won't let you enter a delay time in milliseconds anymore. To do that, first set Tempo to None.

Maximum delay time is 16 seconds on the Axe-Fx III and FM9, and 8 seconds on the FM3.

EQ

The Delay block contains a parametric EQ for the wet signal. Low cut and high cut have adjustable slopes. The EQ stuff is on a separate GUI page with a graphical display.

Forum discussion about EQ-ing repeats

FRACTAL AUDIO QUOTES


[18] IMO, what people like about analog delays are the narrow bandwidth. The noise, aliasing and crud is debatable. The early analog delays typically used fixed anti-aliasing and reconstruction filters. These filters were designed for the worst-case scenario: maximum delay time. Typically at maximum delay time the clock frequency was only 4-5 kHz IIRC which means the filters need to be < 2 kHz. One popular pedal had the filter at 1.75 kHz. They filters also have a very steep cut-off, typically at least 4th-order but usually 6th order. The slope is given by order x 6 so for 6th-order you would set the slope to 36 dB/oct. For those who are interested there's a paper on DAFX about it.

Slope.gif

L/R Time Ratio

Tip: Try 61.8, which is also known as: The Golden Ratio.

For more information see Wikipedia's Golden ratio article or watch Leon Todd's video below.

Drive

The Drive parameter determines the amount of distortion added to the echoes.

Turning up Drive will decrease the level of the repeats.

FRACTAL AUDIO QUOTES


[19] Some blocks have clipping simulation, the delay blocks among others. This simulates the input of the delay line being overdriven (like a real analog delay). It also prevents runaway if the feedback is >= 100%.

If it didn't do that the repeats would get louder until they started clipping.

Time Offset

The Time Offset parameter (Mono Delay only) allows adding up to 100ms of delay to the right wet signal, which can be used for widening effects.

Stack/Hold

When Hold is activated, the wet input to the block is muted and feedback is set to infinity. This can be used to achieve pad sounds and drone notes/chords.

Hold can be controlled with an External controller.

Note: if the Delay is placed in a parallel row with Mix at 100%, an external controller is attached to both Bypass and Hold, and Bypass Mode is set to Mute In, then the Hold function won't work. Solve this by changing Bypass Mode to Mute Out.

When attaching a pedal to Off/Stack/Hold, Heel is Off, Stack is middle and Toe is Hold.

FRACTAL AUDIO QUOTES


Firmware Ares 12 added the Stack feature:

[20] […] Added Stack/Hold parameter to Plex Delay and Plex Verb types in the Plex block. When set to STACK incoming audio is stacked on existing audio and held. When set to HOLD existing audio is held.


Firmware Cygnus v16.02:

[…] [21] Improved Delay block so repeats do not degrade when Hold is activated.


Repeats degrade using Hold on the FM3:

[22] The FM3 is not an Axe-Fx III. To implement this in the FM3 would increase CPU usage which is not worth the trade-off.


Firmware 24.00:

[23] […] Improved Stack/Hold behavior in Delay block. Note that if the Compander is enabled Stack/Hold is not available and will be disabled.


Firmware 24.01:

[24] […]

  • In Hold mode repeats are now infinite (or nearly, may degrade over many minutes/hours).
  • Added Stack Feedback and Hold Feedback parameters. This allows adjusting the decay time independently for the stack and hold modes.
  • Improved transition between Stack/Hold states.

Note that if the Compander is enabled and/or Bit Reduction is greater than zero that the echoes will degrade over time. If you want infinite repeats then Compander must be OFF and Bit Reduction set to zero. Infinite repeats are also not available in the Tape types as the tape algorithm is inherently lossy (like a real tape).

Ducking

FRACTAL AUDIO QUOTES


[25] To gain basic understanding try extreme settings in an experiment. Start with a "hot" delay mix of about 50%.

The first way you might do this is to set DUCKER ATTENUATION to 80 dB and then adjust the DUCKER THRESHOLD, from the top down—starting at 0.0 and lowering it to hear how ducking kicks in. This will teach you where your threshold is most dynamic.

Another good experiment is to set the THRESHOLD all the way down to -80dB and then increase the DUCKER ATTENUATION from 0-dB upwards. This helps you understand what a reduction of "X" dB sounds like.

Once you have extreme ducking dialed in, you can play with RELEASE to see how it works.

After this, you should be able to set all three controls so they suit your needs.

Master Feedback

This goes up to 200% to create oscillating delay effects.

Diffusion

Increasing Diffusion smears the separate delay trails, creating a reverb-like effect. It increases CPU usage a little.

Diffusion has its own LFO modulation parameters, demonstrated by the Zephyr delay type.

The Delay blocks on the FM3 do not have Diffusion parameters to save CPU usage (they share a DSP with amp modeling). This means that certain delay types are not available on the FM3.

FRACTAL AUDIO QUOTES


[26] We had to make a management decision. Under certain circumstances (using an Amp block and two Delay blocks with Diffusion on) the second DSP could get overloaded. The easiest solution at this time was to remove the Diffusion parameter. If we are able to improve the code efficiency we will reinstate the parameter. You have to realize the FM3 has only about 1/5 the DSP power of an Axe-Fx III. Trying to fit all those goodies in there while not sacrificing audio quality is a balancing act. I ALWAYS insist on quality over quantity. That's what differentiates our products. It takes a LOT of horsepower to do it right.

[27] Dug my PCM70 out of the closet and compared the diffusion to the Axe-Fx III. The Axe-Fx III is vastly superior. The PCM70 sounds metallic and comb-filtered. The Axe-Fx III sounds like a little reverb is added to each delay.

[28] I designed the Axe-Fx diffusers to sound like little reverbs. I like a little, 10-20%, which makes the echoes slowly turn into a wash. To me the PCM70 goes "brzzzzpppp" on the attack which I don't find pleasant at all. I've experimented with diffusers for years. I hate all the examples in the literature (i.e. Schroeder allpass sections). I've implemented quite a few out of the papers and they all sound like crap IMO. I tried the allpass cascade in the JCRev algorithm again today and, yup, still sounds as bad as I remember.

Compander

Current Axe-Fx III, FM9 and FM3 firmware provides virtual companders in the Delay blocks. A compander compresses the signal at the input and decompresses it again (expands) at the output. This results in better SNR ratios.

Disabling the compander saves CPU.

Because of the compression due to the compander, spillover is affected.

If the Compander is enabled, Stack/Hold is not available.

FRACTAL AUDIO QUOTES


[29] A Compander is a compressor followed by an expander. If the time constant of the compressor and expander are the same (and the "channel" is perfect, i.e. linear and lossless) then a Compander is transparent. If you change the time constant of one vs. the other the transients will become distorted.

The "Transients" knob controls the time constant mismatch. Negative values smooth the transients, positive values enhance the transients.

A Compander with transient enhancement can be used on kick drums, bass, etc. to add punch. Transient reduction can be used to reduce plosives.

For guitar you can use the Compander to add or remove pick attack.

[30] […] The first step in adding compansion to the delay block was creating a compander algorithm. So I created a Compander type first in the Compressor block.

Once that was working I used that algorithm in the Delay block. The Compander allows you to set the Ratio, Time, Transients and Level. Turn Transients down and the attack is reduced, turn it up and the attack is enhanced. You can use it with kick drum to enhance the punch, put it on vocals to reduce plosives, etc.

[31] The DMM, DM2, and Carbon Copy have it on by default.

[32] […] The HIGHER the compander threshold the more prominent the effect. It's the threshold that makes the compander do what it does. An ideal compander would have a threshold of negative infinity dB. A real compander suffers from a finite detection threshold which is what causes the softening of the transients.

The ubiquitous NE570/SA571 has a threshold of about -60 dB so that's the default.

[33] That's unavoidable without losing spillover. When the compander is active the data is compressed before being written to the delay line and decompressed when being read. So if you switch from not using the compander to using the compander uncompressed data is expanded which makes it louder.

Config (legacy)

This parameter has been removed in firmware Ares and later.

PREVIOUS GENERATIONS


[34] The Config parameter selects the base algorithm. The Type parameter selects the default parameters. If you selected the Deluxe Memman type and then changed the Config to dual you got the dual delay algorithm with the Memman default values.

Tips, tricks and troubleshooting

Factory presets

The Delay block is showcased in many factory presets. Search the Factory presets page for "delay".

Change pitch when adjusting delay time

Only the Mono Tape delay type changes the pitch of the delay trails when adjusting the delay time.

To force other types to same behavior, attach a modifier to the Delay Time parameter.

FRACTAL AUDIO QUOTES


[35] […] The original algorithm simply slid to the new time which would cause pitch shift. People complained vociferously since tapping in a new tempo would cause a pitch glitch. The new algorithm does not do this. It treats time/tempo changes as "requests" and cross-fades between two delays running simultaneously.

If you want pitch shift the use the Mono Tape type. There are other ways as well but I'm not at my desk now so I forget the details. I believe if you attach a modifier to the Time parameter in the other types it will pitch shift when you change the time. I seem to remember I made it so you could do the pitch shift thing with a modifier but not when tapping in a tempo or setting the time by hand. I.e., you can do the Eruption dive-bomb by attaching an expression pedal to the Time parameter.

Prevent cutting off tails when using a pedal

By attaching an external controller (connected to a pedal or switch) to the Input Gain parameter, you're controlling the delay level at the input stage. This will make delay trails fade out nicely when muting the delay.

Use Ping-Pong delay to test stereo output

The Ping Pong delay type lends itself well for checking the stereo output of the unit. The first repeat should be heard at the LEFT side.

Delay settings for lead guitar

For a lead tone with ambient delay, try this: Stereo Delay, Tempo 1/4, Right Time Ratio 61.8%. You can use these settings with a stereo or mono rig.

Fixed number of repeats

If you need an exact number of repeats, use the Band Delay type or Tap Ten Delay type in the Multitap Delay block.

Micro-Delay

The delay can be set to create a micro-delay for enhanced stereo separation.

FRACTAL AUDIO QUOTES


[36] Another way would be to use the Delay block. Set the Mix to 100%, dial in the desired amount of delay and set Balance to full right.

Or use the Enhancer block instead.

Effect on delay trails only

To add an effect to the delay trails only, not to the direct tone, place the Delay block in a parallel row (Mix at 100%) and add the effect after it.

If you want reverb on the delay trails only, try the Diffusion parameter in the Delay block. This smears the separate delay trails, creating a reverb-like effect.

Engage a delay automatically by setting tempo

If the parameter Auto Delay in the Tempo menu is set to “ON,” any delay blocks that are bypassed will become active whenever a tempo is tapped in. This allows you to set the tempo and un-bypass your delay block(s) from a single footswitch. Read this: Tempo

Rack effects processors from the 80s

Watch Leon Todd's video below for recreations of various rack effects processors from the 80s, including SPX90, 2290, PCM780 and H3000.

Turn the reverb into a delay

Firmware 20 for the Axe-Fx III added the ability to use Pre-Delay in the Reverb block as a simple echo. Pre-Delay provides Tempo, Feedback and Mix parameters. The pre-delay time has also been increased to 1s. Several Reverb types demonstrate the capabilities: Echo Plate, Echo Hall, Echo Room.

More information

Videos