via JovianPyx in this electro-music.com thread where you'll find follow-up thread and an audio sample.
"I have designed a synthesizer made of only filters. There are no oscillators in the design at all. It is also up to 32 voice polyphonic. I call it PolyDrum.
It has 32 state variable filters and 32 single pole IIR filters and is implemented on a $39 FPGA development board.
The state variable filters form "resonators" and the single pole filters form exponentially decaying envelope generators. The envelope generators modulate the Fc input of the state variable filters to provide a variety of pitch modulation effects.
Each resonator is frequency, Q, EG and MIDI note number programmable. More than one resonator can be programmed to respond to a given note number - but all of the resonators responding to the same note number will begin their sound with a synchronized pulse
EDIT ADD 2009-12-05:
I should have added that the instrument is played (MIDI) by sending an impulse to any resonator that receives a match between the note played and the resonator's note number map (assignable). If the Q values are large enough, it will be very tonal with a long sustain."
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MATRIXSYNTH - EVERYTHING SYNTH
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MATRIXSYNTH - EVERYTHING SYNTH
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