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Difference between revisions of "Pitch block"

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=Explanation of Pitch block parameters=
 
=Explanation of Pitch block parameters=
  
==Pitch Economy==
+
==Economy==
 
Some types in the Pitch block in the AX8 and FX8 provide an Economy mode. This offers comparable audio performance with lower CPU usage.
 
Some types in the Pitch block in the AX8 and FX8 provide an Economy mode. This offers comparable audio performance with lower CPU usage.
  
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This parameter comes before the Voice Level parameter. So when Feedback is turned up and Level is turned down, you'll still hear repeats.  
 
This parameter comes before the Voice Level parameter. So when Feedback is turned up and Level is turned down, you'll still hear repeats.  
  
=Pitch block and CPU=
+
=Pitch block and CPU usage=
  
 
<blockquote>"Once the CPU usage crosses a certain threshold (which could happen if you are streaming audio) the pitch detection will slow down as the global pitch detector necessarily has a lower priority than the primary audio processing. If you change the Pitch Source to Local then the local pitch detector runs at the same priority as the audio." [http://forum.fractalaudio.com/axe-fx-ii-discussion/87537-downtuning-pitch-shifter-fw15-sound-not-great.html#post1060042 source] </blockquote>
 
<blockquote>"Once the CPU usage crosses a certain threshold (which could happen if you are streaming audio) the pitch detection will slow down as the global pitch detector necessarily has a lower priority than the primary audio processing. If you change the Pitch Source to Local then the local pitch detector runs at the same priority as the audio." [http://forum.fractalaudio.com/axe-fx-ii-discussion/87537-downtuning-pitch-shifter-fw15-sound-not-great.html#post1060042 source] </blockquote>
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<blockquote>"Pitch detection has a lower priority than audio processing. If CPU usage is very high the pitch detectors won't run often". [http://forum.fractalaudio.com/threads/no-fluency-in-whammy.109916/#post-1315869 source] </blockquote>
 
<blockquote>"Pitch detection has a lower priority than audio processing. If CPU usage is very high the pitch detectors won't run often". [http://forum.fractalaudio.com/threads/no-fluency-in-whammy.109916/#post-1315869 source] </blockquote>
  
Pitch on the AX8 is particularly sensitive to available CPU.
+
The Pitch block in the AX8 and FX8 is very sensitive to CPU load, even far before the limit is reached. When using the Whammy mode for example, try to keep CPU usage below 60 - 70%.
  
 
=Pitch Learn mode=
 
=Pitch Learn mode=
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=Special Pitch effects=
 
=Special Pitch effects=
 +
 
==Arpeggiator==
 
==Arpeggiator==
 
The Arpeggiator mode uses 16 steps. [http://forum.fractalaudio.com/axe-fx-ii-preset-exchange/54410-example-how-get-32-steps-arpeggiator.html Here's how to expand to 32 steps.]
 
The Arpeggiator mode uses 16 steps. [http://forum.fractalaudio.com/axe-fx-ii-preset-exchange/54410-example-how-get-32-steps-arpeggiator.html Here's how to expand to 32 steps.]
  
 
==Octaver==
 
==Octaver==
There are several ways to create an Octaver effect (octave down):
+
Several ways to create an Octaver effect (octave down):
 
* set the Pitch block to Fixed Harmony, 1 octave down
 
* set the Pitch block to Fixed Harmony, 1 octave down
 
* set the Pitch block to Octave Divide
 
* set the Pitch block to Octave Divide
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==Detune (micropitch)==
 
==Detune (micropitch)==
Pitch detuning is a great alternative to a Chorus effect. There's no "swirl", associated with that 80's chorus tone. Use it in stereo for a very wide effect.
+
Pitch detuning is a great alternative to a chorus, without the "swirl" associated with 80's chorus tone. Use it in stereo for a very wide effect.
  
 
# Detune up and down the same amount, between +/-5 and +/-10
 
# Detune up and down the same amount, between +/-5 and +/-10
# Delay the voices for more width (let's say 7 ms)
+
# Delay the voices for more width (i.e. 7 ms)
 
# Set mix at 25% or lower
 
# Set mix at 25% or lower
# Put the block after the Amp block but before the (stereo) Cab block
+
# Put the block after the Amp block but before the stereo Cab block
 
# Pan the voices for a wide stereo effect.
 
# Pan the voices for a wide stereo effect.
  
Beware of phase cancellation when running a mono rig.
+
Beware of phase cancellation when running mono.
 
   
 
   
 
==Whammy pedal==
 
==Whammy pedal==
Use the Classic and Whammy pitch types, and attach a pedal to the Control parameter.
+
Use the Classic Whammy pitch types, and attach a pedal to the Control parameter.
  
 
Use Auto-Engage in the modifier menu to automatically engage the Pitch block.
 
Use Auto-Engage in the modifier menu to automatically engage the Pitch block.
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==Dropped tuning==
 
==Dropped tuning==
Use a Pitch block at the start of the grid and set it to Fixed Harmony. Select the desired voice. Mix: 100%, Tracking: On, Pitch Track: Poly.
+
# Use a Pitch block at the start of the grid and set it to Fixed Harmony.
 +
# Select the desired voice.
 +
# Mix: 100%, Tracking: On, Pitch Track: Poly.
  
 
If you can't stand the latency (there always will be some!), try Simeon's ADSR trick, [http://forum.fractalaudio.com/axe-fx-ii-discussion/57165-how-reduce-latency-down-shifted-patches.html explained here] and [http://forum.fractalaudio.com/axe-fx-ii-recordings/72204-fas-modern-ii-pitch-shift-block-5-semitones.html#post884487 here].
 
If you can't stand the latency (there always will be some!), try Simeon's ADSR trick, [http://forum.fractalaudio.com/axe-fx-ii-discussion/57165-how-reduce-latency-down-shifted-patches.html explained here] and [http://forum.fractalaudio.com/axe-fx-ii-recordings/72204-fas-modern-ii-pitch-shift-block-5-semitones.html#post884487 here].
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Harmony scales are explained in the Axe-Fx II manual.
 
Harmony scales are explained in the Axe-Fx II manual.
  
=More information=
+
=More pitch shifting information=
* [http://en.wikipedia.org/wiki/Pitch_shift Wikipedia]
+
* [http://en.wikipedia.org/wiki/Pitch_shift Wikipedia.]
* [http://www.youtube.com/watch?v=-vccabyl5LE Ola Englund demonstrates pitch harmony with a pedal]
+
* [http://www.youtube.com/watch?v=-vccabyl5LE Ola Englund demonstrates pitch harmony with a pedal.]
  
 
[[category:Axe-Fx]]
 
[[category:Axe-Fx]]

Revision as of 13:21, 26 November 2017

The information on this page supplements the official manuals.

Pitch: supported by which Fractal Audio products

  • Axe-Fx II: yes.
  • AX8: yes.
  • FX8: yes.

Pitch: X/Y support

The Pitch block in the Axe-Fx II, FX8 and AX8 supports X/Y switching.

Pitch block before or after the Cab block

"When going direct, pitch shifting often sounds best when placed BEFORE the Cab block. The factory presets may have the block doing the shifting (pitch or multidelay) after the Cab block. Try moving the pitch before the Cab for smoother results."

"The pitch block basically shifts the entire cab freq. response up/down if it's after cab. A slight detune might sound about the same either way but with a half step, whole step, etc. the difference becomes more apparent." (Bakerman)

Pitch: custom harmonies

AustinBuddy created a tutorial about using custom harmonies.

Explanation of Pitch block parameters

Economy

Some types in the Pitch block in the AX8 and FX8 provide an Economy mode. This offers comparable audio performance with lower CPU usage.

Track: Poly or Mono

The Pitch Track parameter in the Fixed Harmony and Whammy modes offers these settings: Off, Poly, and Mono. Poly works best for shifting chords and/or lower amounts of shift. Mono works best for shifting single notes and/or larger shift amounts.

Source: Global or Local

This parameter determines which signal the Pitch block uses for tracking:

  • Global (default): the signal at the input of the grid (pitch controller) is used to track the pitch. This will usually do, unless there are specific demands or when the CPU load is high (see below).
  • Local: the signal at the input of the Pitch block on the grid is used to track the pitch. Use this when you need accurate and fast pitch detection in high CPU usage presets.

Voice: Feedback

This parameter comes before the Voice Level parameter. So when Feedback is turned up and Level is turned down, you'll still hear repeats.

Pitch block and CPU usage

"Once the CPU usage crosses a certain threshold (which could happen if you are streaming audio) the pitch detection will slow down as the global pitch detector necessarily has a lower priority than the primary audio processing. If you change the Pitch Source to Local then the local pitch detector runs at the same priority as the audio." source

"Pitch detection has a lower priority than audio processing. If CPU usage is very high the pitch detectors won't run often". source

The Pitch block in the AX8 and FX8 is very sensitive to CPU load, even far before the limit is reached. When using the Whammy mode for example, try to keep CPU usage below 60 - 70%.

Pitch Learn mode

The Pitch block has a Learn function. Turn it on, play a note and hold it: the device will now set the key according to the note you played.

Special Pitch effects

Arpeggiator

The Arpeggiator mode uses 16 steps. Here's how to expand to 32 steps.

Octaver

Several ways to create an Octaver effect (octave down):

  • set the Pitch block to Fixed Harmony, 1 octave down
  • set the Pitch block to Octave Divide
  • use the Ring Modulator in Tracking mode.

Crystals

Detune (micropitch)

Pitch detuning is a great alternative to a chorus, without the "swirl" associated with 80's chorus tone. Use it in stereo for a very wide effect.

  1. Detune up and down the same amount, between +/-5 and +/-10
  2. Delay the voices for more width (i.e. 7 ms)
  3. Set mix at 25% or lower
  4. Put the block after the Amp block but before the stereo Cab block
  5. Pan the voices for a wide stereo effect.

Beware of phase cancellation when running mono.

Whammy pedal

Use the Classic Whammy pitch types, and attach a pedal to the Control parameter.

Use Auto-Engage in the modifier menu to automatically engage the Pitch block.

You can engage a Whammy on the fly without using Auto-Engage:

  1. Put a Pitch block in line, set to Classic Whammy. Source: Global. Bypass Mode: Thru.
  2. Assign the Control parameter to your pedal's external controller.
  3. Assign the same external controller to the Mix parameter. Set Mix at zero. Modifier menu: Start 40, Mid 100, End 55, Slope 0, Scale 10, Offset 100.
  4. Make sure the Pitch block is engaged and save the preset.

Demo of the Whammy settings above.

Increase the Scale parameter in the modifier menu to create some "flat" space at the top, so the octave arrives earlier and stays put.

Dropped tuning

  1. Use a Pitch block at the start of the grid and set it to Fixed Harmony.
  2. Select the desired voice.
  3. Mix: 100%, Tracking: On, Pitch Track: Poly.

If you can't stand the latency (there always will be some!), try Simeon's ADSR trick, explained here and here.

Shimmer

Read this: Shimmer.

Dive bomb

To simulate an automated "dive bomb" pitch effect:

  1. Create a preset with a Pitch block.
  2. Set Pitch mode to Classic Whammy, Up|Dn 2 Oct., Pitch Track: off, 100% mix.
  3. Enter the Modifier menu of the Control parameter in the Pitch block. Set Source to one of the externals. Set Damping to 750, for starters.
  4. Enter the Modifier menu of the Bypass parameter in the Pitch block. Set Source to the same external controller as above.

On the foot controller:

  1. Program a switch to send the external controller's CC.
  2. The switch can be latching or momentary, whatever works for you.

To operate: select the preset. Press the switch (press and hold if it's a momentary switch) for the effect to kick in. Press again (or release) to stop, and bypass the Pitch block.

You can also use your expression pedal instead of a switch. Use the corresponding external controller.

Instead of a switch, you can also use Auto-Engage.

You can adjust the length of the dive through the Damping parameter, use another Whammy mode, make it even more dramatic by adding a Flanger, etc.

Harmony scales

Harmony scales are explained in the Axe-Fx II manual.

More pitch shifting information