Swish2 is a six part multi-timbral percussion and effects synthesizer. Each voice consists of a mono/stereo white noise oscillator and state variable filter, intended for the 'swish' sounds endemic to early electronic music.
The resonant filter self-oscillates producing a sine component useful for emulating analog percussion like kicks and snares. My most common usage is as a stereo 'reverb' to reinforce clap sounds. The oscillators can be synced or run continuously.