The CGS735 is a 'tribute' module based on the awesome Steiner-Parker Synthacon VCF.
Resonance is a bit unusual in its behaviour. Once it starts oscillating, the [RESONANCE] control needs to be backed of a fair way to get it to stop again. It can also be frequency dependent.
Please note that the current build is a shallower design at less than 60mm.
Sample Sound - Synthacon99
Sample Sound - Batchas