• Stochas is a previously commercial software that is now open source
  • If you are an existing customer of Audio Vitamins please be aware that they will no longer be providing support for this product. Please open an issue in the issue tracker.
  • Source, issue tracker and more available on GitHub
  • Original Audio Vitamins manual is here. Updated manual is in the works.
  • Introductory video
  • Do a youtube search for “audio vitamins stochas tutorials” to see more tutorials



Stochas screenshot


  • Cross-platform MIDI sequencer surfaced as a VST/AU/etc. plugin
  • Suitable for both drum and melodic programming
  • Allows random selection of designated notes in a sequence (random or semi-random melodic lines)
  • Allows random triggering of notes (more dynamic and varied drum patterns)
  • Adjust randomness of note start times for more humanized playback
  • Adjust randomness of note velocity and length
  • Fully MIDI-programmable interface for live performance. Mute/unmute layers, change patterns, time signature, etc. on the fly via MIDI
  • Chain mode allows procedural programming (e.g. “if this note plays/doesn’t play then always/never play this other note”)
  • Adjust note start time to move sequence “off the grid”, as well as note length
  • Record incoming MIDI to grid
  • Use Chord mode to quickly add chords to the sequence
  • Select from preset scales, or customize notes in grid along with note names; save/load note names from file
  • Add swing or groove; import groove from MIDI files
  • Create up to 4 layers with different time signature, playback speed and/or number of steps per layer
  • Create up to 8 patterns


Stochas was originally developed as closed source software back in 2016 and was made available for sale by Audio Vitamins. The original idea sprang from a JSFX plugin (Reaper plugin) created by Andrew Shakinovsky called Stochasticizer which allowed semi-random sequencing of melodic and drum lines. Andrew was contacted by Dave Clissold of Audio Vitamins who suggested creating a plugin that would work in any DAW. The two worked together to design the product which was released a few months later. Due to lack of time to devote to marketing a commercial product, in 2020 it was decided to release the software as open source in the hope that it would be useful to music producers around the world.