SY03 is a VC low pass filter and VCA in one module. The VCA is hard-wired in series after the filter output.

The filter is a transistor ladder 'Moog' type filter. Resonance can be set to feedback.

Audio input signal attenuator for the signal coming into the SIG12 socket.

CV input signal attenuator for the signal coming into the CV1 socket.

Alters the filter cut-off frequency.

Alters the filter feedback level.

VCA CV level attenuator for the signal coming into the VCA CV socket. When no jack plug is in that socket, the control is used to attenuate a full CV level (+12v).

Signal input to the filter, level affected by SIG1 control.

Second input to the filter. There is no level control.

Cut Off CV input, level affected by CV1 LEVEL.

Second CV input. There is no level control.

VCA CV level input, level affected by VCA LEVEL control. When no plug is in this socket, the VCA receives a full (+12V) CV level, which can then be attenuated by the VCA LEVEL control.