[sdiy] DIY polyphony handler

Tom Wiltshire tom at electricdruid.net
Tue Jan 22 20:41:04 CET 2019

I did an autotune routine recently, but there are two main problems with it:

1) You really need a high resolution DAC. For a basic CV, you can get away with fairly limited resolution, especially if the Note CV has modulations added to it, rather than produced directly by the DAC.

2) You need to provide a CV per oscillator, not per voice. Obviously the tuning between one oscillator and another isn’t identical, so the CVs have to be adjusted specifically for each one. That makes for quite a lot of CVs quite rapidly.

Aside from that, it isn’t too difficult. The code is pretty straightforward.


       Electric Druid
Synth & Stompbox DIY

> On 22 Jan 2019, at 19:05, ulfur hansson <ulfurh at gmail.com> wrote:
> hello list!
> i have a few diy voice “cards” (meaning various prototypes ziptied together) of my own design laying around, and have been thinking it’d be neat to build a 6-voice midi CV/gate handler for polyphonic playing.
> all parameters are currently voltage controlled, so building a rudimentary knob control panel is easy - however, when it comes to choosing DAC’s and microcontroller platforms, i’m a little lost!
> does anyone have experience building a basic setup like this? i’m thinking up to 8x round robin pitch CV’s and Gates.
> (bonus feature; DIY autotune anyone?)
> thanks!
> Sent from outer space
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