Resonant lowpass gate with variable filter slope, RC-envelope generator, and slew

Sinc Bucina is the sequel to one of Noise Engineering's first modules, Sinclastic Empulatrix, replacing the clamping VCA with a resonant lowpass VCF and VCA combo. The velocity-dependent Ping input offers classic release-only LPG behavior, while the Gate input offers much more complex slewing, useful for simple ASR envelopes to dynamic modulation. The envelope out allows the internal envelope to be routed out into a patch for even more versatility and modulation fun.