Vermona Perfourmer MKI SN D 04736 4 voice Analog Synth

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"It sounds great... Everything works except voice 2 & 4 Res encoder.
Not sure what's the issue. It worked fine the last time (2012) I used it.
But when testing out tonight, it has no effect on that voice. (unless I wiggle the encoders)
It could be cold solder joints. ?? Possibly an easy fix.
Even so, this synth sounds amazing.
Analog, water-like bubbles from the LFO to VCF...
Monster growls in unison mode...
It's a super - extremely versatile - synthesizer.
MIDI control.. No CV option."