# Wavetable Polysynth in a Crumar Stratus case

**URL:** https://lookmumnocomputer.discourse.group/t/wavetable-polysynth-in-a-crumar-stratus-case/5222
**Category:** DIY STUFF
**Created:** [July 1, 2022, 11:08am UTC](https://lookmumnocomputer.discourse.group/t/wavetable-polysynth-in-a-crumar-stratus-case/5222 "2022-07-01T11:08:05Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![craigyb](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/craigyb/32/21602_2.png) [@craigyb](https://lookmumnocomputer.discourse.group/u/craigyb)
#### Post date: [July 1, 2022, 11:08am UTC](https://lookmumnocomputer.discourse.group/t/wavetable-polysynth-in-a-crumar-stratus-case/5222/1 "2022-07-01T11:08:05Z")

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This massive old chunk of technology started out as a dead Crumar Stratus that I picked up cheap, I repaired all the filter boards etc and it was fine but boring.

So I had the crazy idea to replace the organ based tone generators with a VCO of some sort. I settled on the Electric Druid VCDO1 which is a wavetable 8 bit oscillator with a main 16 wave table and a 32 wave sub.

After a lot of messing around I decided to rip everything out and start again. New oscillator boards, new multi pole filters, a new LFO and new env generators.

It has 999 memories, dual VCDO per voice, 24 dB multi pole filters and a 16 wave LFO, 3 env gens per voice for pitch, filter and amp with velocity available on each.

[![](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/5/7/5762c50d15110a8bfa3067830b1926580c94e67f.jpeg "VCDO based Polysynth in a Crumar Stratus case") ](https://www.youtube.com/watch?v=aCucBx5niDk)

 ![20220207_202712](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/2/4/243d04c0d54502be43c5f628e0e70c56651f83b9.jpeg)  
 ![20220204_172756](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/6/4/64be692af678b63012417560ea3c547759e1391f.jpeg)  
 ![20211107_205842](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/9/c/9c889a65dd5f4edfa83bb5df738cb63c0061561d.jpeg)  
 ![20211106_112435](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/5/b/5b4b4dda2d0ccde462d9acb9c2ffb4fc35abddba.jpeg)  
 ![20211106_094934](https://global.discourse-cdn.com/free1/uploads/lookmumnocomputer/original/3X/d/2/d237b087ec6c5f1fedfa02cc9069d1f8197192b7.jpeg)

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### Author: ![Jos](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/jos/32/151_2.png) [@Jos](https://lookmumnocomputer.discourse.group/u/Jos)
#### Post date: [July 1, 2022, 1:11pm UTC](https://lookmumnocomputer.discourse.group/t/wavetable-polysynth-in-a-crumar-stratus-case/5222/2 "2022-07-01T13:11:39Z")

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Very impressive build and it sounds good as well!

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### Author: ![craigyb](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/craigyb/32/21602_2.png) [@craigyb](https://lookmumnocomputer.discourse.group/u/craigyb)
#### Post date: [July 1, 2022, 1:13pm UTC](https://lookmumnocomputer.discourse.group/t/wavetable-polysynth-in-a-crumar-stratus-case/5222/3 "2022-07-01T13:13:28Z")

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Thanks, this is one of my longest ongoing projects and I’ve used it as a learning platform. Never used Arduino or Teensy in anything before.