Hi,
As you know, there is just the one exponential convertor that is shared
by all of the voices. Maybe it's not calibrated correctly? If you have a problem
with all of the voices, then it must be something that is common to all of them,
right?
I can make measurements for you if you like. Mine seems to be working OK.
The tuning is not perfect, but it's
pretty close.
Bob
From: "josh.nursing@gmail.com" <josh.nursing@gmail.com>
To: PolySix@yahoogroups.com
Sent: Thursday, February 27, 2014 5:30 PM
Subject: [PolySix] RE: Polysix tuning difficulties.
To: PolySix@yahoogroups.com
Sent: Thursday, February 27, 2014 5:30 PM
Subject: [PolySix] RE: Polysix tuning difficulties.
I have been through the tuning process a couple of times. Both times I hit the upper limit of tuning for most of the voices.
One of the VRs when turned (and if memory serves me well, it might have been a global VR) does a strange thing: when I turn it CCW, the pitch goes down but then slowly rises again. When I turn it CW, the pitch rises but then slowly starts to drop. Thus, it's just not possible to tune the Polysix properly. I am not sure where the issue is but it looks to me it could be a capacitor acting up? I might have to check the VR as well.
A couple of checks on the opto-coupler eliminated it as the source of potential issues: it is still functional.
Yash