Caustic Editor for Volca Sample

Rej - Dev's picture

Christmas comes early for Volca Sample owners.

KORG were nice enough to open up their volca sample SDK to 3rd parties so I took a few days to rip out Caustic's WAV editor and turn it into a stand-alone, multi-platform tool that lets you import, load, record, edit and upload samples for use with your KORG Volca Sample device. It was taken from my Caustic 3.2 working branch, so it even has a few more functions than what's in Caustic 3.1!





- Record your own samples using your device's built-in microphone.
- Load any uncompressed, mono or stereo WAV, at any sampling rate or bit depth.
- Apply any of 16 of Caustic's effects and preview them in real-time, then stamp down and apply more.
- Process waveform audio with Fade In/Out, Normalize, Amplify, Reverse, etc.
- Use Caustic's C-SFXR to generate retro video game sounds.
- Trim audio precisely, down to individual samples.
- View the frequency spectrum of your audio.

- iOS: Audiobus compatible (receiver)
- iOS: AudioShare compatible (import/export)
- iOS: AudioCopy/Paste compatible (import/export)
- iOS: iTunes file sharing support
- iOS: Open In... support for .wav files.

Volca Sample-specific features:
- Upload to any of the 100 sample slots and keep a database of your device's state.
- Clear all samples
- Restore factory samples
- Monitor device memory

This is not an official KORG app, it is made by me, Rej Poirier / SingleCellSoftware using the KORG volca sample SDK.

The app is free, with no ads and no IAPs. If you'd like to support my work, please buy Caustic or any other of my apps. If you have them all... make a donation to the Red Cross. There are people out there who need the money more than I do this holiday season.

Have fun sampling, merry Christmas, and happy Saturnalia.


Download links: (App size is ~5 Mb)


Android Google Play - Direct APK

Windows Installer - Stand-alone ZIP (Unzip to run from a USB drive for example)

MacOS X - DiskImage (run directly from the dmg first if you get issues running from Applications)

​iOS - AppStore

Linux: From reports of Caustic users, the Windows versions should run fine under WINE. You might need to first run "winetricks vcrun2008" to get the right DLLs.


If you've never used Caustic's WAV editor, check out these video tutorials:

Sample (wave) Editor Tutorial - Caustic 3

C-SFXR tool



Restoring Factory Samples to Volca Sampler

  • I have downloaded Caustic Sample Editor to both the Galaxy J7 and to Windows 10.
  • Volca sample reads Error when I attempt upload 

  • Do any buttons need to be  active on the volca for the transfer to be enabled?

  • Do I need to download samples from KORG's site to pair with the editor?

  • I have messed with playback volume control on the ​editor.
  • Is there anything else I should try?




a couple of weeks ago I bought a Volca Sample, downloaded the Caustic Editor to my Android phone and transferred a sample to the sequencer. so far, so good.

however, in recent days I tried to load more samples onto my Volca Sample, but it doesn't function anymore. the Volca remains in "LIVE" mode through the syncing and doesn't switch to "DATA" anymore. the virtual content in your software changes, but somehow the data doesn't find its way to the machine. it's strange, because when I connect my phone to the Volca the blinking "tempo" light on the machine becomes a static red light, which signalises to me that the Korg recognises the connection and that the problem can't be the cable. according to the Caustic Editor the memory  should have increased from 90 to 92% with it. I also tried the Caustic Editor for Mac since then, but with the same outcome.

I tried everything I could think of – I changed the length of my samples, thinking they are probably too long (I tried all kinds of lengths, even very brief "ping"s), of course I tried to sync only one sample after another, I tried to amplify some samples like it was mentioned here earlier (without any avail), I tried to delete samples and restore factory samples, change mono/stereo, whatever, you name it, I changed to airplane mode, etc.

I am at a loss and would highly appreciate if someone could help me with this.