Re: Strange detuning after not using my x0xb0x for a while
There are a couple of things that immediately become obvious:
1. The CV is way off near the bottom. C1 is pretty close to 2v, so that's ok. All other C's should be multiples of this; (C0 by 0.5 of course). So the proper value for C0 should be 1v. 0.65v is very far off.
On the other hand this may have something to do with your multimeter since the measurements of the resistors (while being roughly in the ballpark) did lack the expected precision. After all those should be 1% precision resistors and right now I can't see a scenario where all resistors would have roughly 2.5 precision instead. Do you have access to another multimeter?
2. The values shouldn't change for Note On/Note off at all. In fact there is no provision in the whole CV circuit to distinguish between those two states; the Gate circuit is fully independent from it.
Another test: Play the highest C (two octaves up) and measure the voltage on the following pins of IC9:
2, 15, 5, 12, 7, 10