iPad Screenshots


csGrain is a real-time audio processing and recording tool that lets you create new sounds and new musical textures by transforming your voice, your instrument, or your favorite songs from your iTunes library in subtle or dramatic ways - all with the power of CSOUND. Under the hood is a stereo granular sound processor and 10 additional professional audio effects – all realized through a single Csound orchestra that is simultaneously: rendering, processing, sampling, resampling, synthesizing, resynthesizing, playing, reversing, delaying, triggering, gating, compressing, limiting, chorusing, flanging, echoing, filtering, pitch-shifting, harmonizing, granulizing, and recording – in any combination – all in real-time, and all 100% being done with the power and exquisite sound quality of CSOUND - the world's premier software synthesizer and signal processor.


A Live Audio Multi-Effects Processor
Import and Remix Songs from iTunes or "myTunes" (your Tunes!)
Audio Processing
Live Recording
Soundfile Editing
Dropbox Integration
Email-based File Transfer
AudioCopy/AudioPaste to/from other iPad Apps
MIDI Trigger and Control of All Parameters
Support for Professional External Audio and MIDI Interfaces
Sample Loops
Exquisite and Imaginative Presets
A Comprehensive User Manual

What’s New

Version 1.4.3

- Audiobus updates, fixes
- Dropbox fixes
- Dropbox support update
- AudioBus 3.0 support
- GUI Updates
- Link to Current Csound Manual Online
- Silence Main Audio on Auxiliary Views
- Bug Fixes

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

AurePhD ,

Must-have effects powerhouse for the iPad

csGrain is a must-have effects powerhouse for the iPad. The sounds, usability, and musicality of the instrument are at least on par with the Moog apps, but the the potential for extension and customization far surpasses anything else. If you want to blow your mind in two seconds flat with this app, just press and hold any of the parameters (esp the sync grain ones) and a randomization window pops up, change the parameters and get instantly out of this world sounds. I really like the integration with Dropbox and AudioPaste functionality. And while you don't need it at first, the manual is very well written for when you want to dig deeper. My only complaint is that the app is not yet in Retina-display, but I am sure that will be coming soon. Another nice feature improvement would be to augment the midi capability, which is already awesome, to allow for automatic learning of cc messages based on input like the way Ableton Live works. All in all, this is most powerful effects application on the iPad. Good job!

nutate ,

Redefines what an audio app can do

The iPad has seen some great audio apps, but the bar has been raised with csGrain. If you know the history of csound you'll know it is a powerful, but opaque audio synthesis/processing language. csGrain capitalizes on that power and gives you granular synthesis, delay, pitch shifting, chorus, high pass, low pass and more... And most importantly *everything* goes to ELEVEN.

Now for the best parts, it plays well with MIDI devices, audio copy/paste, Dropbox!, and you can crop audio inside the app. It can process live audio (and record), process loops... I've barely played with it, but I confident it's up there with animoog and a few others as the cream of the crop.

C3l3$t1n0 ,

There is nothing wrong with this!

This is an update to my original review. See my old review after the new one. The app in it's current form is not working with iOS6. I sent an email to Boulanger Labs and they are already in works for an update.

The interesting thing was that they answered the message very quickly and answered other questions regarding future support. Suffice to say, csGrain is a great app and it will be better on the next updates.

Original Review:

I haven't even read the manual yet, but I have been able to mangle a field recording by just tweaking the knobs.

I cannot imagine how great this effects system will work as I learn more from it. Pretty glad I got it.

Now, for it's next update, I wish for audio copy/paste to rapidly use the capabilities of csGrain and integrate into iOS DAWs.


Richard Boulanger
99.2 MB

Requires iOS 10.0 or later. Compatible with iPad.



Age Rating


  • Family Sharing

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

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