iPad Screenshots


StompBox turns your iPad into a flexible Multi FX Processor, it includes 17 effects plus a 4 Track Recorder and Media Player.

StompBox supports AudioBus and Apple’s Inter-App Audio making an excellent general purpose audio processing tool for all musicians, not just guitarists.

As seen in Apples "Love" iPad TV Commercial.

With StompBox you get the best of both worlds, a rack of professional sounding stereo effects (with far more control than simple foot pedals) and a foot controller to access a tuner and all your patches.

Simply listen through a pair of headphones, or attach to an external amplifier or hifi to truly experience the program in all its glory!

Once you have built up a library of patches, you can use the virtual foot controller to quickly and easily move between patches. The Virtual Foot controller gives instant access to all patch parameters and amp settings, with the ability to enable and disable individual effects at the touch of a button. If you want to modify an effect parameter, simply scroll the effect rack into view and make your changes.

Guitar and Bass Multi FX Processor
16 Unique Effects available
7 Types of Distortion
Chain upto 12 Simultaneous Effects
Media Player with Time Stretching
4 Track Loop Recorder (In-App Purchase)
Metronome/Chromatic Tuner
Stereo Routing
Save 12 banks of 6 patches
Virtual Foot Controller
Virtual Whammy Pedal
Tap Tempo
Compatible with range of hardware interfaces
3 Unique Skins

Many guitar apps use a form of Amp Modelling which in most cases is just fancy form of EQ. This is great for electric guitars, but not so good for accoustic. StompBox allows various amp EQ's both via the PreAmp and additional effects, but the important thing for accoutic guitar users is that these EQ's can be completely bypassed. This is where StompBox really shines, giving a faithful reproduction of accoustic instruments. This also means StompBox can be used on keyboards too.

If you have any questions or issues you can contact us on http://www.4pockets.com/support

What’s New

Version 1.54

Fixed an issue with the iRig Blueboard and other MIDI controllers that send multiple patch change messages with a single button press.
Added better transitions between patches.

Ratings and Reviews

2.3 out of 5
4 Ratings

4 Ratings

GtrGeorgeDC ,

Needs a lot of Power...

Nice assortment of effects, nicely laid out, and reasonably easy to program once you get the hang of it. BUT:

If you are serious about using this for a performance effects device, be sure you have the fastest, most powerful iPad or iPhone you can get: 1) It's true that you can use lots of effects in a preset, but the more effects you use at once, the more of a demand it puts on the processor. 2) Latency has to be at the fastest setting, or StompBox is WAY behind you. 3) If you're set to the fastest latency setting, StompBox disables some of the more demanding effects. On an original iPad Mini, for example, several of the presets came up with the Pitch Shift effect disabled and a message came up telling me this effect cannot be used at the Low or Ultra Low latency setting.

If you're not sure, I strongly suggest you try the LITE version first. That way, if it doesn't work, you're not out too much money...

Light Interactive Media ,

Great potential and features! But output clips/distorts with a keyboard.

I wanted to love this app for playing live (since there are actually very few music apps geared toward the needs of using an iPad live). But with my Yamaha s90 ES plugged in an iRig and an out to my M-Audio AV40s (using the correct stereo-mono cables!), I get a bad clipping distortion when I use any kind of velocity on the S90. This happens at even low volumes set on iPad, Stompbox, etc. When I turn off all effects, it is almost gone. iShred Live does not do this, so I know it's with Stompbox.

Another gripe I have is that one of the absolute essentials when playing live with a band is the need for TAP TEMPO. I'm so happy Stompbox has this, but could we get a button to hit a bit bigger than the tip of our finger? Also would like to swap the volume pedal (or have an additional...) for an actual good-sized volume slider. When I'm playing the Yamaha on top of a Hammond with a Grand next to me, I can't afford to be so precise when going to my iPad for stuff - got to be on the fly, easy to read, easy to hit, etc.

It would be really great for us to be able to redesign the interface to fit our needs - use less pedals for larger size, etc.

I appreciate the time and effort that went into this app - it's got some GREAT effects racks. I hope to make this app my main effects for keys some day, because the other things it does, it does really well.

spleenomatic ,

App has amazing potential, but still has issues...

This app looks good, and seems to have immense potential to live up to being a major player. I would really like to use this app more than I do/can. But I have a lot of issues with it crashing suddenly. I have tried all the suggestions in the included help files, I know I have an iPad capable of running it, but unfortunately I still seem to reach a certain point and it just disappears suddenly.
I love the stereo effects. The distortion presets are spot on and do not need much tweekage, in my opinion. And best of all the whole app is set up just like it should be. It is a really exciting rack for any serious guitarist. The persons who thought this through have my compliments and respect.

But then, there is the sudden crashing issue. If this could be corrected, well, I would be using this app almost exclusively. I have increased my rating from my last review in hopes that the developers will notice and perhaps address some of the issues mentioned. It's frustrating, I know. But I feel this app is really worthy of another look.


Limelight Software
24.4 MB

Requires iOS 7.0 or later. Compatible with iPad.


English, French, German, Japanese, Korean

Age Rating
In-App Purchases
  1. Loop Station $2.99
  2. Digital Reverb 2 $2.99
  3. Growler $1.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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