[sdiy] Polymoog Polycom chip block diagram?

Brian Willoughby brianw at audiobanshee.com
Wed Feb 23 06:01:36 CET 2022

If a Polycom board for one key goes bad, can a replacement from any key position be used?

If they were specific to each key, then the keyboard tracking could be built into the board via unique resistor dividers.


On Feb 22, 2022, at 20:03, Michael E Caloroso wrote:
> Sadly there is no keyboard tracking to the PolyCom ICs.
> Only the sole master VCF has keyboard tracking.
> MC
> On Mon, Feb 21, 2022 at 2:35 PM Mattias Rickardsson wrote:
> Michael E Caloroso skrev:
> > So, is it a VCF at all? If so, where does the control voltage come from?
> It is a VCF, and its CVs come from fixed voltage dividers when a preset of selected.
> I guess it also applies some keyboard tracking to the control voltages? 
> Otherwise it wouldn't be necessary with one VCF per key. :-)
> /mr

More information about the Synth-diy mailing list