Vintage Synth Repair

Hi again ~

Well so far so good. I replaced the power supply caps and a handful of sliders and was able to minimize the drift in the VCOs. It's sounding pretty good in my opinion. A couple of new issues surfaced though. I'm hoping someone has encountered this before:

1. It seems that there is always a note being played. Perhaps another way to describe it is that the release just never really releases? I can play normally and everything will basically subside but you can hear a very faint continuation of a note carrying on. If I turn up release you can hear that remaining note loud and clear.

2. Very odd - but VCO2 tune works in reverse. I have the slider installed correctly but sliding it towards sharp sets it to go flat and vice versa. I picked up used sliders; on this slider one of the mounting pins is broken. These appear to be for ground too but I don't *think* this should cause that sort of behaviour.

3. Just an observation more than anything but when I was checking voltages on the test points it would affect the voltage and in turn slightly shift the sound. touching a component such as an IC would radically change the sound. It's as if a ground is lifted somewhere? If I bolt it all down nothing out of the ordinary really happens (aside from the above here).

Thanks again!