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Reaper JS plugins for ambsionic processing

April 2, 2013

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Over the past few days I’ve been looking into how to make JS audio effect plugins for the Reaper DAW program. JS is a scripting language which is compiled on the fly and allows you to modify and/or generate audio and MIDI, as well as draw custom vector based UI and analysis displays. JS effects are simple text files, which when loaded in REAPER become full featured plug-ins.

JS plugins are simple and fast to develop, and I have made a bunch for processing of ambisonic sound field recordings:

  • YAW rotation (around the up axis)
  • PITCH rotation (around the right axis)
  • ROLL rotation (around the front axis)
  • 1st order encoding of mono source
  • 1st order encoding of stereo source (treated as two mono sources)
  • 1st order super stereo encoding (I still need to apply 90 degree phase offsets to signals in order to complete this one)

I’ve set up a GitHub repository where you can grab the code/plugins and follow further development.