Moog Prodigy 336A Synthesizer, Rare "S Trig" Socket

via this auction
"This is a rare, later version with S trigger in/out, keyboard in/out, oscillator in, vcf in, sync in and hi level audio out. A must if you want to interface with CV/Gate or MIDI/CV devices. Employs two voltage controlled oscillators (VCOs) with saw, triangle and pulse waveforms. Also, a genuine Moog 24dB / octave lowpass filter, A/D/S envelope generator, and LFO with square or sine waveforms and routing to the VCF, VCO or both. Even has Portamento, Pitch and Mod wheels. Works great with no scratchiness in pots or switches. I have owned it for approximately 7 years. The wood appears to have been refinished at some point. One small dent as seen in pictures.

2 syncable VCOs with the classic 24dB moog ladder filter, two ASD/R and a simple LFO.
The two vcos are similar but they have different waveforms and different “feet” settings.
VCO1 has the 32′ and offers Pulse, Saw and Tri waveforms.
VCO2 has the 4′ and TRi, Square and Saw.
The second vco has a detune knob and can be synced to vco1 creating many complex waves.
Using the Pitch Wheel with the sync on , the wheel “move” only the VCO2 creating big alterations in the waveform content.
Then there is a mixer/vca part , the Filter with cutoff, (env)Amount, and Emphasis (resonance) and the two envelope ADS/ASR.
The LFO is quite simple and offers square and tri waves with a rate control that can go from 0.3Hz to 30 Hz."

SN 10750