This Moog Opus 3 is a classic early-80s paraphonic analog ensemble synthesizer, designed as a performance-oriented “string machine + organ + brass”

 Manufacturer: Moog

Year: ~1979–1980

Designer: Herbert A. Deutsch

Type: Analog subtractive, divide-down ensemble synth

Keyboard: 49 keys

Polyphony: Full (all notes playable simultaneously via divide-down architecture)

Oscillator system: Divide-down (single top-octave generator split across keys)

LFO: Waveforms: triangle, square, saw up/down. Routes to pitch (vibrato) or filter (wah-like effects)

Envelopes: Global + section-specific shaping

Filter types: 24dB Moog ladder (brass/shared). Multi-mode filter (strings)

The Opus 3 is tri-sectional, and all three sound engines run in parallel:

1. Strings

Multi-mode filter (low / band / high pass) with resonance

Dedicated envelope (ADSR/AR depending on routing)

Built-in chorus (signature lush sound)

2. Brass

Moog-style 24dB ladder filter with resonance

Envelope shaping

Can share routing with other sections

3. Organ

Divide-down organ with drawbar-style tone shaping

No dedicated resonant filter (more static tone shaping)

All three sections can be layered simultaneously and can be balanced with individual volume + panning controls

The synth has been fully serviced by a Music Electronics Engineer. No Degraded foam. Fully functional power supply, divider chips, sliders and pots. No dead sections.

In Excellent cosmetic and functioning condition. Comes with a soft carrier case and a wooden protection box (see photos).

This synth should grace the shelves of any discerning Music Instrument Collector.