Need help with POLY 61 mod

[plasticanimal]

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?

[Gordonjcp]

You'd need some sort of amplifier to compensate for the loss through the pot.

[plasticanimal]

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?

[Gordonjcp]

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.

[plasticanimal]

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.