Worked on an autopilot based blade vortex interaction algorithm.
It's a separate XML file which can be adapted to any chopper. It
outputs a single property which drives the volume for the blade
vortex interaction sound.
Found a CC0 source for an R44 sound. So I sped it up to match the rotor RPM
of an R22. And then I split the sample to two frequency bands. One
representing the engine sound and the other the blades and I'm driving the
two slices of the same sound with their own properties. Works pretty well.