Drummerizer

Doppler turns any audio source into percussion. Feed it an oscillator, a sample, a synth voice, anything, and it shapes it into kicks, snares, hi-hats, and textures in between. One continuous sound source for organic drum synthesis, smoothly morphing from one drum sound to another. Change the source, get a new drum set.

The core mechanism is a delay-line pitch processor. Audio written into a delay line is read back at a moving position, and that movement creates pitch shifts, exactly like the Doppler effect when a sound source passes you. A trigger resets the read head, which then sweeps toward a target depth, creating a falling pitch envelope. That's the kick.

Beyond Doppler, the module offers FM synthesis using the input audio itself as a reference for frequency tracking, and harmonic chording using multiple pitch-shifted delay taps. The Mod knob sweeps continuously through all of these: from pitch-shifted chords at one end, through Doppler kick territory in the middle, to aggressive FM at the other end.

https://jasmineandolivetrees.com/products/doppler