View source for VP4 virtual pedalboard

__TOC__

[[image:VP4-front.jpg|400px]]

[[image:VP4-rear.jpeg|400px]]

=References=

Read the excellent owners manual first!

* [https://www.fractalaudio.com/vp4 Product page]
* [https://www.fractalaudio.com/vp4-downloads/ Downloads]
* [https://forum.fractalaudio.com/#vp4.154 User forum]
* [http://wiki.fractalaudio.com/wiki/index.php?title=Category:VP4 Wiki pages]
* [https://forum.fractalaudio.com/threads/vp4-faq.208790/ FAQ]

Documentation:
* [https://www.fractalaudio.com/downloads/manuals/VP4/VP4-Owners-Manual.pdf Owners Manual]
* [https://www.fractalaudio.com/downloads/manuals/VP4/VP4-Quick-Start.pdf Quick Start Guide]
* [https://www.fractalaudio.com/downloads/manuals/VP4/VP4-4CM.pdf 4CM]

=Pictures=

See &ldquo;[https://forum.fractalaudio.com/threads/owners-show-their-vp4-boards.208709/ Owners show their VP4 boards]&rdquo; for a discussion how forum members are using their VP4 units.

=Comparing VP4 and AM4=

Fractal Audio: [https://forum.fractalaudio.com/threads/differences-between-am4-and-vp4.216961/#post-2729434]

AM4 and VP4 both deliver Fractal Audio’s industry-leading sound quality, world-class effects, and rock-solid reliability. They're the same size and form factor and use streamlined UI designs that are intended to be as easy to use as real pedals. The two products share the same core technologies used across the Fractal Audio product family. They both also offer "gig mode" footswitch operation, gapless switching, USB audio, MIDI, professional connectivity including Auto-Z analog in and SPDIF I/O, plus optional "expert" editing—on the device or with companion software. The difference is largely down to features around intended use:

The <b>AM4</b> delivers top-tier amp tone and effects. We say it is "perfect for a pedalboard" but it is also an ideal standalone for a desktop or "fly rig". It includes the full AM4 Amp block with integrated DynaCab™ speaker simulation, UltraRes™ user cabs, plus a selection of stompbox and studio effects. It has balanced line level outputs, a top panel level knob, a headphones output, and a stereo analog insert for using 3rd part "post" FX without the need for a separate DI box.

The <b>VP4</b> delivers Fractal Audio effects for use with any amp or modeler. It does NOT perform amp modeling but it does have multiple instances of almost every effect block from the Axe-Fx III including the new IR Player. It has unbalanced outs and is unity-gain by design so no top panel level knob or headphones jack. It has a mono 4CM mode for running pre and post effects at the same time. The VP4 works extremely well as a sidekick to AM4 (AM4+VP4 = "MVP-8").

=Using VP4 and AM4 together=

There are various ways to combine the VP4 and AM4.

; VP4 Out > AM4 In (analog)

: Connect the output jack on the VP4 to the instrument input on the AM4.

; AM4 Out > VP4 In (analog)

: Connect the output jack(s) on the AM4 to the analog input(s) on the VP4.

; VP4 > AM4 (SPDIF)

: Connect SPDIF Out on the VP4 to SPDIF In on the AM4.

; AM4 > VP4 (SPDIF)

: Connect SPDIF Out on the AM4 to SPDIF In on the VP4.

; AM4 >< insert VP4 (analog)

: Put the VP4 in the insert loop of the AM4, using an insert cable.

; VP4 >< 4CM AM4 (analog)

: Set to the VP4 to 4CM, and put the AM4 in loop of the VP4.

Use MIDI Program Changes or "Scene Sync" to synchronize switching on both devices.

=Specifications=

==Design and development==

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<HR>
<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-mystery-product-speculation.6102/#post-239385]
It's not a replacement for any of our current products.
</blockquote>

<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-mystery-product-speculation.6102/page-251#post-270357]
That's the target market. We have more products in the pipe for that market.
</blockquote>

<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-mystery-product-speculation.6102/page-217#post-268907]
Its primary application is live performance and the UI was designed with that in mind.
</blockquote>

<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-mystery-product-speculation.6102/page-243#post-269736]
It uses premium analog components and converters. The input stage is FET and the op-amps are all "iPolar". None of this cheap CMOS stuff that other products are using.
</blockquote>

<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-mystery-product-speculation.6102/page-243#post-269736]
Adding MIDI clock should be easy. The VP-4 code was frozen before it was implemented in the Axe-Fx III and the FM-3/9. The only development allowed after code is frozen is bug fixing.

The product focus was on three things: quality, simplicity and flexibility.
Re. quality. It uses premium analog components and converters. The input stage is FET and the op-amps are all "iPolar". None of this cheap CMOS stuff that other products are using.

No product will ever satisfy everyone. If low price is your primary concern then the product is not for you. If having lots of simultaneous effects is your primary concern the product is not for you. If having up to four, high-quality effects from the Axe-Fx III in a small, pedal board-friendly format is what you want then this product is a compelling choice.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/vp4-vs-fm3.208723/page-3#post-2612127]
The Axe-Fx III and FM9 have essentially the same analog path as the FX8. The VP4 is similar and offers the same fidelity.
</blockquote>

<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-vp4-virtual-pedalboard.6698/page-54#post-299821]
[…]
The VP4 uses the latest "flagship" products from Cirrus as do the Axe-Fx III and FM3/9.

[…]

Equally important, if not more so, is the analog path driving the A/D converter and buffering the D/A converter. We use premium components and a full-differential topology. Many companies use a single-ended topology as it is less expensive. Many companies also use low-cost op-amps (i.e. CMOS vs. the iPolar and BiFet parts we use).

</blockquote>
</blockquote>

==Processing and memory==

A meter in the upper right shows the current CPU usage. To ensure smooth performance, a limit of about 80% is enforced, leaving required processing power in reserve. If this limit is exceeded, the VP4 will switch to bypass mode and a warning will be shown: “CPU LIMIT: Bypassed.”

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<HR>
<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-mystery-product-speculation.6102/page-242#post-269736]
The VP-4 uses the Axe-Fx III DSP's little brother. It's a single core version with the same instruction set so porting stuff from the Axe-Fx III is almost trivial.
</blockquote>

<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-mystery-product-speculation.6102/page-252#post-270388]
The VP4 uses a SoC. It has an ARM Cortex A15 core and a C66x core along with a bunch of peripherals. The DSP in the Axe-Fx III would be too power-hungry for this application.
</blockquote>

<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-mystery-product-speculation.6102/page-250#post-270349]
It's quite possible we could add more blocks in future firmware. I can envision, say, four switchable blocks and two fixed blocks per preset. The fixed blocks are always on. The switchable blocks can be bypassed/engaged. Or four fixed blocks and four switchable blocks. 

It's just software. It's a fairly powerful processor, more powerful than the FX8 had, but our algorithms have continued to increase in complexity and require more processing power than things did back in the FX8 days.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/please-add-a-looper-to-the-vp4.211081/page-2#post-2712981]
It has the same amount of RAM as the FM-9.
</blockquote>

</blockquote>

==Latency==

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<hr>
In response to the question &ldquo;Is there any information on latency in normal use and in 4cm?&rdquo;
<blockquote>
[https://forum.fractalaudio.com/threads/latency.208751/#post-2608085]
The latency of the unit is 1.2 ms. 
</blockquote>
</blockquote>

See [[Latency]] for more information.

==Screen==

The display is a 480 x 272 high-contrast color LCD.

The VP4 does not have a touchscreen.

==Dimensions and weight==

; Weight : 3 lbs 7 oz (1.56 kg)
; Dimensions : 10.00" x 6.31" (254mm x 160.3mm)

[[image:VP4-dimensions.jpg|500px]]

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<HR>
<blockquote>
[https://forum.fractalaudio.com/threads/vp4-dimensions.208906/#post-2609873] I measured the protrusion of the jack with the greatest depth (SPDIF) and it's about 9mm.
Cables would be extra.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/vp4-faq.208790/post-2611397]
Using anything other than the factory-provided feet and screws will void your warranty.
The approved screws are M3.5x8mm, with approximately 5mm protruding into the VP4 chassis. Internal components are aligned with the screw holes, so if third-party screws extend too far, they may cause damage to these components. Such damage will be identifiable and not covered by the warranty.
For safe mounting, Velcro is the recommended solution.
</blockquote>
</blockquote>

==Power==

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<hr>
<blockquote>
<font color=red>
[https://forum.fractalaudio.com/threads/important-use-the-provided-9v-1-3a-1300ma-adapter-provided-with-your-vp4.209672/]
IMPORTANT! Use the 9V 1.3A adapter provided with your VP4. Starting around December 2025, a 9V 1.5A adapter will be provided, to match the one supplied with the AM4.

If you are not using the provided adapter or an equivalent 9V adapter, you may experience unit lockup, crashing, noise, loss of audio, or loss of data.

If you are experiencing any of these symptoms (or other unusual behaviors), please power your VP4 with the provided power supply before reaching out to support. 
</font>
</blockquote>
</blockquote>

The power connector is a 2.1mm barrel connector, with a negative center. The 9V power-supply is included. 

The unit has a power button. It powers up in a few seconds.

See &ldquo;[https://forum.fractalaudio.com/threads/can-i-power-a-vp4-with-a-strymon-zuma.208929 Can I power a VP4 with a Strymon Zuma?]&rdquo; for a discussion about VP4 power supplies.

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<HR>
<blockquote>
[https://forum.fractalaudio.com/threads/announcing-the-new-vp4-virtual-pedalboard-compact-multi-fx-processor.208713/post-2607596]
The maximum current draw is 1.3A. Typical draw is less than 1A but we cannot guarantee proper operation if using a supply below the rated specification. It can run on 12V and the current draw will be lower in this case.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/vp4-no-wakey.211431/#post-2644538]
Do NOT use an AC supply. You WILL damage the unit.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/fractal-audio-vp4-lithium-backup-battery-replacement.213011/page-2#post-2668178]
No internal battery. It uses EEPROM to store system parameters. Presets are stored in FLASH. 
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/🔥introducing-the-new-am4-amp-modeler.216932/page-26#post-2729714]
(November 2025) We'll start shipping VP4s with the 1.5A adapter even though that unit requires only 1.3A.

</blockquote>
</blockquote>

=Analog I/O=

==Input==

Mono/stereo input, two 1/4" TS jacks, max +20dBu (instrument level/line level).

The VP4 defaults to mono input, but can be switched to stereo in SETUP.

[[Input impedance]] is variable and is adjustable per preset.

The [[Audio_in_and_out#Instrument_input|Input pad]] in SETUP is adjustable, with auto correction. The manual states that the VP4 is pre-configured for a typical guitar with hot pickups. If input clipping occurs, an &rdquo;IN CLIP&ldquo; warning is displayed and the Input Pad setting is temporarily increased.

<blockquote>
'''OWNERS MANUAL'''
<HR>
<blockquote>
If the input of the VP4 clips persistently, the unit will automatically increase the Input Pad
setting. When this occurs, the word “Auto” will appear next to the Input Pad value, for example: “12 dB (Auto)” indicating that
the pad was automatically increased to 12 dB. When you reboot the VP4, the automatic setting is cleared, and the last manually
selected value is restored. If you want to make the automatic pad setting permanent, just turn the Input Pad knob one “click” to
clear “Auto” and set the desired value. While "4CM Routing" is enabled, a common input pad setting is shared by both PRE and
POST inputs. Excessive levels at either of these will cause the automatic pad setting to be applied to both.

''If the input still clips with the pad setting at 18dB, decrease the output level of the device(s) connected to the VP4 input(s).''
</blockquote>
</blockquote>

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<hr>
<blockquote>
[https://forum.fractalaudio.com/threads/stereo-in-sound-better-than-mono-with-a-mono-guitar.210706/#post-2634134]
If you configure the Input for STEREO, you MUST connect 2 cables (both left and right), otherwise you will no longer get unity gain. If your signal is "weak" in MONO mode, then you have a configuration issue somewhere in your rig.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/input-clipping-at-18db-concern.215368/#post-2706349]
The input range of the VP-4 is the same as an 18V pedal. 
</blockquote>
</blockquote>

==Output==

1/4" TS, L/R (mono/stereo), max +16dBu, 600 Ohm. [[Audio in and out#Balanced_and_unbalanced_signal|Unbalanced]]. No [[Humbuster]].

The unit defaults to stereo output. Switchable in SETUP. See <q>[[Audio_in_and_out#Mono_vs_stereo|Mono vs stereo]]</q>

The Output level is [[Audio in and out#Unity_gain|unity gain]] unless configured otherwise.

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<HR>
<blockquote>
[https://forum.fractalaudio.com/threads/announcing-the-new-vp4-virtual-pedalboard-compact-multi-fx-processor.208713/page-3#post-2607580]
All of the outputs on the VP4 are unbalanced.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/thoughts-on-2-x-vp4%E2%80%99s-1-for-in-front-1-for-fx-loop-of-an-amp.208727/post-2608734]
Humbuster is not necessary because it's DC powered and the chassis is floating. Hum occurs due to ground loops. If equipment is AC powered the chassis must be grounded by law. This introduces ground loops when using unbalanced connections. The correct solution is for everything to be balanced but the industry seems reluctant to embrace that.
</blockquote>
</blockquote>

==4CM==

[[Audio in and out#4CM_.28Four_Cable_Method.29|4CM (Four Cable Method)]] is supported. Mono only!

To enable this, turn on 4CM Routing in SETUP. Only presets configured specifically for 4CM will work with this setup. Using a preset that IS NOT configured for 4CM will switch the VP4 to bypassed mode and defeat all processing.

Global settings for Input Mode and Output Mode (except MUTE) are IGNORED when 4CM Routing is enabled, and only the left channel of the last PRE or POST effect is passed to the respective output. Mono effect types and settings are therefore recommended for a 4CM rig.

Remember that many stereo effects have controls like STEREO SPREAD or MASTER PAN, which can be used to eliminate differences between right and left channels.

The input gate is applied at the PRE input, which also feeds the tuner.

The master PRESET EQ, MAIN levels, and SCENE levels are applied at the POST output.

The Input Pad setting affects both the PRE and POST inputs. If your Amp's send level is particularly hot, this might require a higher pad setting than your guitar.

A set of factory presets is configured specifically for 4CM. See a list of VP4 factory presets at the end of its Owners manual.

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<HR>
<blockquote>
[https://forum.fractalaudio.com/threads/new-fractal-product-coming.207160/page-78#post-2602690]
In L = Guitar<BR>
Out L = Preamp In<BR>
In R = Preamp Out<BR>
Out R = Power amp In
</blockquote>

<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-mystery-product-speculation.6102/page-217#post-268907]
It has the analog path from the Axe-Fx III (which evolved from the FX-8). Beta testers report that it "plays nicely" with difficult fx loops.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/vp4-vs-fm3.208723/page-3#post-2612127]
The Axe-Fx III and FM9 have essentially the same analog path as the FX8. The VP4 is similar and offers the same fidelity.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/vp4-with-fm9.208741/post-2609064]
SPDIF is not supported with 4CM. As you observed, the SPDIF is always stereo.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/questions-about-spdif-output-on-vp4.210081/#post-2625753]
The VP4 is MONO ONLY in 4CM mode.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/how-does-buffered-bypass-work-on-4cm.210816/#post-2635822]
When the unit is analog bypassed, both pre and post paths are analog bypassed.
</blockquote></blockquote>

==Analog insert==

To use the VP4 as an analog insert, for example with the FM3 or AM4, check the Owners Manual.

==Analog bypass==

The VP4 allows a buffered analog bypass mode. This passes the signal directly from input to output without digital conversion, latency, or processing.

This can be enabled through a switch or automatically. To have analog bypass activate ''automatically'' when all four effects are bypassed, engage the option Automatic VP4 Bypass in SETUP.

Note: with Analog Bypass engaged, USB Audio is interrupted. 

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<HR>
<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-vp4-virtual-pedalboard.6698/page-4#post-271823]
We considered analog dry-through early in the design phase but it just causes more problems than it's worth. If it were a dedicated delay or reverb device then it would make sense but once you add drives and wahs and EQs it makes things too confusing for the average user.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/how-does-buffered-bypass-work-on-4cm.210816/#post-2635822]
4CM Mode:<BR>
When the unit is analog bypassed, both pre and post paths are analog bypassed.

</blockquote>
</blockquote>

==Headphones==

In some scenarios the VP4 is the last device in the chain. It's an effects-only unit and therefore doesn't have a headphones port.

If you want to listen to its output directly, without an amp or audio system, you need a headphone amp. A small device will do, such as a [https://rolls.com/product/PM50se Rolls PM50se].

Or connect the VP4 to the AM4 and use the headphone port on the AM4.

=Digital I/O=

==Converters==

24-bit, 48kHz (fixed).

Dynamic range is 114 dB, 20-20k frequency response.

==USB==

USB-C port for data and audio.

MIDI-over-USB is supported.

USB Audio 2.0 provides 4 channels (4x4) at 48kHz.

* OUT channels 1+2: processed output
* OUT channels 3+4 : unprocessed (copy of inputs)
* IN channels 1+2: send incoming USB Audio directly to outputs
* IN channels 3+4 : process incoming USB Audio and send to outputs

Windows computers require a software driver which is available on the [https://www.fractalaudio.com/vp4-downloads VP4 Downloads] page.

See [[USB]] for more information.

==SPDIF==

SPDIF can be used to digitally connect the VP4 to an AM4, FM3, FM9 or Axe-Fx, through RCA connectors, at [[Digital_I/O_and_recording#Sample_rate_is_fixed_at_48kHz|48kHz fixed sample rate]].

A digital connection avoids the necessary A/D and D/A conversion and inherent latency that comes with analog-to-digital connections.

The SPDIF output of the VP4 always mirrors the signal at the analog outputs.

IMPORTANT: When using the VP4 and AM4 together through SPDIF, in whatever order, make sure to crank the SPDIF In Level on the receiving device, to prevent loss of signal level and possibly gain. Also select SPDIF as input source on the 2nd device. And if the AM4 goes first, crank its hardware LEVEL knob.

Read [[Digital I/O and recording]] for more information.

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<HR>
<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-mystery-product-speculation.6102/page-255#post-270805]
[...]
The analog input has to be buffered as well. In most (all?) processors you buffer data up in frames. A typical frame size is, say, 32 samples. You can't start processing that frame until it is full. When it is full you ping-pong and start filling the opposite buffer.

The physical latency of SPDIF is usually no more than a sample or two. A typical A/D converter has a latency of 10-20 samples.

The same thing happens at the output. You read from an output buffer and when it's empty you ping-pong to the opposite buffer.

A typical D/A has a latency of, again, 10-20 samples. A SPDIF output has only a sample or two.

So, in the case where you use a frame size of 32 you get a total buffer latency of 64 samples. If we assume the A/D and D/A are 16 samples each the total latency is 96 samples. If you use SPDIF you'd have about 30 samples less latency.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/vp4-with-fm9.208741/post-2609064]
SPDIF is not supported with 4CM. As you observed, the SPDIF is always stereo.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/questions-about-spdif-output-on-vp4.210081/#post-2625753]
The SPDIF is not supported in 4CM.
</blockquote>
</blockquote>

=PRE and POST routing=

The VP4 can be used before an amp (PRE) or in its effects loop (POST).

Sets of factory presets are configured specifically for PRE and for POST (series or parallel) operation. 
A list is included at the end of the owners manual.

=Firmware=

The [[Firmware|firmware]] is upgradeable, allowing adding new features and bug fixes.

You can download the latest official release from the VP4 [https://www.fractalaudio.com/vp4-downloads/ downloads] page.

Public beta releases are often released on the user forum.

=Control=

==User interface==

Compared to Fractal's modelers, the VP4 UI is simplified and streamlined.

Press <span class="button">HOME</span>+<span class="button">SAVE</span> together to enter the &ldquo;Mode Select&rdquo; menu which allows you to select between Preset, Scene, Effects, and Tuner/Tempo. The mode determines what's displayed on the LCD, how the Select knob operates and what the switches do.

The factory default's &ldquo;Gig Mode&rdquo; configuration makes it easy to select presets, scenes, effects, channels, tuner and tap tempo. The startup mode can be set in Setup.

Press <span class="button">ENTER</span>+<span class="button">EXIT</span> together to enter Setup.

To edit parameters on the hardware, turn <span class="button">SELECT</span> in Effect mode to highlight a block, press <span class="button">ENTER</span> to edit the block, turn the corresponding <span class="button">A-D</span> knob to adjust the value, <span class="button">PAGE LEFT</span> or <span class="button">PAGE RIGHT</span> to get to other pages.

When editing parameters on the hardware, press <span class="button">PAGE LEFT</span>+<span class="button">PAGE RIGHT</span> together to enter &ldquo;Expert Edit&rdquo; mode. Expert Edit includes advanced parameters. Press <span class="button">EXIT</span> to quit Expert Edit.

On the home page in FX Mode, select the desired block, hold the <span class="button">ENTER</span> button, and turn <span class="button">SELECT</span> to move.

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<HR>
<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-mystery-product-speculation.6102/page-251#post-270365]
Behind the scenes it's the architecture from the Axe-Fx III. There's still a grid and scenes and channels, etc. It's just that it's mostly hidden from the user and simplified.
</blockquote>
</blockquote>

Tip: If you don't need scene names, use the available space to indicate the specific effect types instead. Insert spaces to visually align them.

[[image:VP4Names.png|link=|300px]]

==VP4-Edit software editor==

VP4-Edit is the [[Editors|editor]] for the VP4, with [[Fractal-Bot]] built-in. 

You can download VP4-Edit, along with the Windows driver, firmware and factory presets updates, from the [https://www.fractalaudio.com/vp4-edit/ VP4 downloads] page.

[[image:VP4-Edit.png|500px|link=]]

==Onboard switches==

The four foot switches have colored indicators, but no scribble strips.

They support Tap and Hold functions (e.g., to switch channels). Factory default is the so-called <q>Gig Mode</q>. You can customize the functions.

Watch the video at the bottom to see how to select channels.

==MIDI==

The unit has 3.5 mm (1/8”) MIDI IN and OUT ports. Adapters are available from [https://shop.fractalaudio.com Fractal Audio].

The Boss BMIDI-5-35 cable has been tested and works with the VP4 to connect to 5-pin MIDI gear.

The VP4 supports:
* Sending and receiving Program Changes (PC)
* Sending and receiving Control Changes (CC)
* MIDI-over-USB
* MIDI clock (receive only, currently)
* Software MIDI Thru
* Syncing scenes with the AM4

A table in the manual translates MIDI Program Changes to VP4 presets.

The VP4 tempo does respond to MIDI Beat Clock. It does not send MIDI Clock.

See [[MIDI]] for more information.

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<HR>
<blockquote>
[https://forum.fractalaudio.com/threads/announcing-the-new-vp4-virtual-pedalboard-compact-multi-fx-processor.208713/post-2607516]
The VP4 supports MIDI over USB so it appears as MIDI ports in a DAW.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/vp4-fm3-pc-editor-connectivity-question.208827/post-2609096]
Messages sent to the VP4 via MIDI-over-USB are not echoed to its MIDI OUT port, and messages received at its MIDI IN port are not passed to the computer via USB.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/announcing-the-new-vp4-virtual-pedalboard-compact-multi-fx-processor.208713/page-16#post-2609869]
The VP4 has fewer than 128 presets. MIDI Bank Select messages are not necessary to access all of its presets
</blockquote>
</blockquote>

==Expression pedals and external switches==

The unit supports two [[Expression pedals and external switches|expression pedal]] connections (TRS, 10–100 kΩ max), or two single TS [[Expression pedals and external switches|external switches]] (momentary or latching).

The unit does not provide [[FASLINK]] connections and can't connect to [[FC-6 and FC-12 foot controllers]] foot controllers.

==Amp switching==

The VP4 itself does not provide relays to switch amp channels, but it can connect through MIDI to a relay switcher to perform that duty.

Possible solutions include:
* [https://midisolutions.com/prodrel.htm MIDI Solutions Relay]
* [https://www.suhr.com/product/micro-midi-control/ Suhr MicroMIDI Control] 
* [https://voodoolab.com/product/control-switcher/ Voodoo Lab Control Switcher]
* [https://piratemidi.com/products/click-midi-interface-relay-switcher Pirate MIDI CLiCK]
* RJM Mini Amp Gizmo (no longer available from RJM but might be available used. The [https://www.rjmmusic.com/download-content/Amp%20Gizmo%20Manual%20-%20online.pdf manual] is currently available online.)
* [https://emcustom.eu/amp-midi-switcher-interface.html EM]

=Sounds=

==Presets, scenes and channels==

The unit has 104 presets, supports four scenes per preset and four channels per effect block.

The presets are organized into 26 banks, each identified by a letter from A to Z. Within each bank, there are four presets, numbered 1 through 4. Presets can be configured for PRE, POST or 4CM. A list of factory presets is included at the the end of the Owners manual.

Each block has 4 channels.

Switching between presets, scenes and channels is [[Setup_menu#Gapless_Changes|gapless]].

VP4 presets and blocks are not compatible with Fractal Audio's other processors, nor vice versa.

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<HR>
<blockquote>
[https://forum.fractalaudio.com/threads/announcing-the-new-vp4-virtual-pedalboard-compact-multi-fx-processor.208713/page-4#post-2607598]
There are enough dissimilarities between the VP4 and the other products, that preset compatibility is not practical.
</blockquote>

In response to the question: <q>Are saved blocks (no entire presets) transferable between VP4 and other Fractal products?</q>:
<blockquote>
[https://forum.fractalaudio.com/threads/announcing-the-new-vp4-virtual-pedalboard-compact-multi-fx-processor.208713/page-8#post-2607767]
No, many of the effects have changes that facilitate the simplified BASIC mode interface.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/effects-library.208901/#post-2609875]
[...]
Block library entries are not cross compatible between VP4 and other products. Keeping the translator in sync across products/firmware versions is a can of worms, and b) the VP4 also has a few small differences in terms of how things are handled internally.

You can copy settings by hand and things will sound the same, but see the note in the purple box on p. 26 of the manual.
</blockquote>
</blockquote>

The latest factory presets are available on the VP4 [https://www.fractalaudio.com/vp4-downloads/ downloads page] and shown below.

[[image:VP4-facprestst-1.png|900px]]

[[image:VP4-facprestst-2.png|900px]]

[[image:VP4-facprestst-3.png|900px]]

==Effects==

Available effects:

* [[Chorus block]]
* [[Compressor block]]
* [[Delay block]]
* [[Drive block]]
* [[Enhancer block]]
* [[Filter block]]
* [[Flanger block]]
* [[Formant block]]
* [[Gate/Expander block]]
* [[EQ|GEQ block]]
* [[IR Player block]]
* [[Megatap Delay block]]
* [[Multitap Delay block]]
* [[EQ|PEQ block]]
* [[Phaser block]]
* [[Pitch block]]
* [[Plex Delay block]]
* [[Resonator block]]
* [[Reverb block]]
* [[Ring Modulator block]]
* [[Rotary block]]
* [[Synth block]]
* [[Tremolo/Panner block]]
* [[Volume/Panner block]]
* [[Wah block]]

[[image:VP4-Blocks.png|600px]]

Note: there's also an IR player block.

There is a [[Noise gate]] at the input, before the four effects, and a [[EQ|10-band EQ]] at the output of each preset, which are always <q>on</q>.

The VP4 does not provide amp and cab modeling, but an IR Player has been added that has access to up to 256 onboard IRs. Also, compared to the FM3, there's no Multiband Compressor, Ten-Tap Delay, Mixer, Looper, Send/Return and Multiplexer.

Compared to the Axe-Fx, FM3 and FM9, the unit features:

* Additional tweaked types, such as Vibrato and single voice Pitch types
* Tweaked MIX Law for time-based effects
* Mode switch in some Drive types instead of multiple types (e.g. Timothy)
* Some renamed types

Effect blocks 2+3+4 can be routed in parallel with the previous effect.

The blocks support Fractal Audio's system of [[Modifiers and controllers]].

<blockquote>
'''FRACTAL AUDIO QUOTES'''
<HR>
<blockquote>
[https://thegearforum.com/threads/fractal-audio-systems-mystery-product-speculation.6102/page-169#post-264650] <q>Can it run a Dual Detune, Reverb, Delay and a Plex Delay simultaneously, in a non-economy algo mode?<BR>
Yes
</blockquote>
<blockquote>
[https://forum.fractalaudio.com/threads/announcing-the-new-vp4-virtual-pedalboard-compact-multi-fx-processor.208713/post-2608372] <q>Does the VP-4 support the improved FM9/Axe-FX III spring reverb algorithms?</q><BR>
Yes, it is totally up to date with Axe-Fx III in all effects.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/announcing-the-new-vp4-virtual-pedalboard-compact-multi-fx-processor.208713/post-2607516]
The VP4 uses the newest pitch detector from the Axe-Fx III.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/are-the-mix-levels-lower-than-the-equivalent-mix-levels-in-the-fm-and-iii.208988/#post-2611013]
The mix law in many blocks is different to suit the "all effects before the amp" crowd better.
</blockquote>

<blockquote>
[https://forum.fractalaudio.com/threads/are-the-mix-levels-lower-than-the-equivalent-mix-levels-in-the-fm-and-iii.208988/#post-2611186]
The sweetened mix law places a wider range of knob motion in the portion of the curve where the delay is quieter. 

This replicates the way pedals that are designed for use in front of an amp work because the amp's compression reduces the difference between the quiet echoes and the louder dry signal.
</blockquote>
</blockquote>

=Videos=

[[video:Aaron-VP4-Preset]]

[[video:AndyWood-VP4]]

[[video:AB-VP4]]

[[video:Coop-VP4]]
[[video:Cooper-VP4-Modes]]
[[video:Coop-VP4-Presets]]
[[video:Coop-VP4-ScenesChannels]]

[[video:FSM-VP4]]

[[video:GearHippie-VP4-ChangingChannels]]

[[video:JC-LetsTalkAboutIt]]
[[video:JC-VP4-Gigged]]
[[video:Cordy-VP4]]

[[video:Leon-VP4]]
[[video:Leon-VP4-Presetfromscratch]]
[[video:Leon-VP4-Library]]
[[video:Leon-VP4-Essentials]]
[[video:Leon-VP4-SPDIF]]
[[video:Leon-VP4-Marshall]]
[[video:LT-FactoryPresets]]
[[video:LeonVP4X88]]

[[video:LM-VP4]]

[[category:VP4]]
[[category:Sounds]]
[[category:Remote]]
[[category:All]]