Making a Korg MS-01 Foot Controller Equivalent

I wanted to see how a foot controller might expand what I can do with my self-restored classic Korg PolySix made around 1980-81. I didn't want to pay $150-200 for an original MS-01 foot controller, so with a little bit of snooping around on the interweb and asking some questions at a certain online forum I determined what the pedal does and how I wanted to build an equivalent foot controller using a Crybaby wah pedal enclosure.

[murkyhole]

I want to thank you for posting this. because it got me started on making a very excellent addition to my polysix experience. I was looking through my polysix manual and getting curious about the vcf foot pedal. I did not find much about it. I had to dig pretty deep. finally after recreating your project here with a crybaby and getting fairly weak results, I found that the plug in the back of the polysix wants -5v to +5volts. NOT the 0 to +5 volts OR 0 to -5 volts that the Korg ms-01 provides. I designed and made my first ever circuit from scratch using a center tap transformer, a voltage rectifier, negative and positive 5v voltage regulators. I made it so the crybaby sweeps through the the full range of the vcf: from low inaudible to high freq. by providing -5 through +5 volts. It makes my synth feel much more like playing a real instrument by using the vcf foot control. Thanks again

[mwmusic]

Thanks for this! We recently rebuilt a Polysix and I’ve been trying to figure out the right pedal to use. This looks like a great project - thanks for sharing!

[jasonmcgary]

Would you be interested in making me one for a price?i have a empty wah shell i could send you.100$ i will pay for shipping?or you let me know.i need a expression pedal like this that provides its own voltage for the moog grand mother it is 5 volts per octave.i am not that electronics savy to do this myself.please let me know