Ian Fritz' "Double Pulse Waveform Shaper" redrawn by me to avoid haggling over copyright (not from Ian--I doubt it, anyway). This circuit is similar to normal pusle-width modulation but creates separate positive and negative pulses. Sounds different, sounds good.

This schematic has the basic idea tricked out with some extra controls for more fun. It's an old version with old opamps, etc. I hope to get it updated in the future.

Bi-pulse schematic (~12k, pdf)

Note: since I oringinally posted this Ian has come up with some new designs with more features. Go to his web page and click on the "schematics" link under "Wind Synth". You'll see the links to the DPWG and the "Wavolver" further down the page.
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