MATRIXSYNTH: VCDO based Polysynth in a Crumar Stratus case

Saturday, June 08, 2024

VCDO based Polysynth in a Crumar Stratus case

video upload by Craig Barnes

"A 6 note polysynth design that I have been building on and off for about 3 years since i had the idea. I gutted an old Stratus as I got it very cheap and the original idea was to only replace the organ generation circuits with real VCO's or DCO's to feed the Stratus CEM filters etc. But as it developed I ended up replacing more and more of the Stratus with my own designs or interpretations of designs I've found on the web. It switched between CEM3340 VCO's an Electric Druid VCDO1 chips, eventually settling on the VCDO1 chips even though the waves are only 8 bit, its very PPGish.

The specs are as follows.

Dual Electric Druid VCDO1 oscillators with modified firmware for new waveforms and performance.
Multipole filters similar to the Shruthi design but using the CEM3320 and pole mixing. 16 states, resonance, key tracking, EG depth & invert and looping.
LFO with 16 waveforms, slope and delay, depth and multiple destinations. Electric Druid TAPLFO3.
White Noise source based on the Electric Druid Noise 2
3x EG's per voice, Pitch, Filter and Amplifier, switchable velocity on each EG, Electric Druid EnvGEN8c.
Bit Crush on the waveforms
Poly/Unison modes
999 memory locations
MIDI and CV in/outs and can be used to drive CV based equipment"

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