I'm trying to add a OSC balance pot on the first voice to use in monophonic mode. I got it to work but in poly mode that voice is noticeably quieter than the other five. I used a 10k dual gang pot before the caps and resistors on each OSC path just before they meet. Should I use a different value pot or do I need to do something else?
You'd need some sort of amplifier to compensate for the loss through the pot.
Ah, OK. Thanks for the help. Seems like it may not be worth the effort now. Hm, anybody know of a way I could multiply the parameter over six voices without having six separate pots? Maybe use vactrols?
Sounds like you'd need to build some VCAs. If you look in the service manual for the Poly 61, you'll see there are two VCAs used in each voice - one for resonance, one for final VCA - consisting of two transistors and a couple of resistors.
I see what you're saying. I've never built anything like that but I'll give it a try and see how that goes. I'll probably try a filter in mod while I'm at it. Thanks for the help Gordon.