Doof Snare
A low tom-like snare.
The signal follows 2 parallel paths.
Path 1: The noise through the filter, then to VCA-A.
Path 2: The oscillators into VCA-B.
Midi pitch and envelope B are summed to control the VCO’s pitch. This simulates the pitch sweep effect created when a snare’s heads stop vibrating at different times.
Further Reading:
SOS: Synthesizing Drums: The Snare Drum
SOS: Practical Snare Drum Synthesis
Moritz Klein : Designing a TR-808 style snare drum from scratch