AVR Synth

"The AVRSYN is a monophonic "virtual analog" synth based, originally, on the Atmel AT90S8535 microcontroller and was designed by Jarek Ziembicki. His aim was to check to see if a simple micro could be used for sound synthesis purposes. And the result? The AT90S8535 managed to do all the tasks: front panel switches and pots services, receiving and processing MIDI messages, and sound generation!

The synthesis architecture is simple:-
two DCO's, a DCF, and a DCA. There is also an LFO and an AR/ASR envelope generator.

Sound samples: 1 2 3

Paul Maddox jumped in at this point and started to design a pcb for the unit but selected the
ATMEGA16 as the AT90S8535 is no longer a production item. Paul has had to temporarily withdraw from this process and so I have taken over the reigns and am releasing the pcb, along with an optional kit of components, to assist those who wish to build and/or develop their own AVR-based synthesiser."

via CDM