Moog — Subharmonicon

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Moog Subharmonicon Eurorack Cheat Sheet

Type: Semi-modular analog polyrhythmic synthesizer (60HP Eurorack compatible)
Main Features:
- 2 VCOs (each with 2 subharmonics, 1-16 integer division undertones)
- 4 Rhythm Generators (integer tempo divisions, create polyrhythms)
- 2 x 4-step Analog Sequencers
- Moog 4-pole Ladder Filter
- Dual Envelope Generators (Attack/Decay, for VCF & VCA)
- 32-point Patchbay (17 In, 15 Out)

Quickstart

Power: +12V only, 360mA max (no -12V). See manual for safe installation.
Audio Out: 1/4" on the back, or VCA OUT on patchbay (Eurorack level, 10Vpp).
Basic Flow: Oscillators > Mixer > Filter > VCA > Audio Out.
Rhythm Generators: Divide master tempo by 1-16 (per generator), assign to sequencers for polyrhythms.
Sequencers: 4 steps per, pitch (and optionally integer division for subosc), assign to VCO, Sub 1, and/or Sub 2.
Patchbay: Use to break internal routing and integrate with external CV/midi/eurorack.

Panel Controls

Knobs

VCO FREQ (1 & 2): Oscillator frequency, 4 octave range (Middle C to C6).
SUB FREQ (x4): Division from 1-16 (clockwise = unison, counter = /16).
Waveform Select (toggle, x2): Square / PWM + Sub Saw / Saw.
Mixer Levels: VCO 1, SUB 1, SUB 2, VCO 2, SUB 1, SUB 2.
CUTOFF: VCF Cutoff, 20Hz–20kHz.
RESONANCE: Self-oscillate at max.
VOLUME: Main output level.
VCF EG: ATTACK (1ms–10s), DECAY (5ms–10s), AMT (bi-directional).
VCA EG: ATTACK (1ms–10s), DECAY (5ms–10s).
TEMPO: .333Hz–50Hz (20–3000 BPM).

Buttons

SEQ n ASSIGN: Assign step CV to VCO, Sub 1, and/or Sub 2.
Quantize: 12-ET, 8-ET, 12-JI, 8-JI, OFF.
SEQ OCT: ±1, ±2, ±5 step range.
PLAY: Sequencers on/off.
RESET: Resets sequencers/rhythm.
NEXT: Advances step.
EG: On/Off/Held (Hold to tune with EGs open).
TRIGGER: Manual envelope retrigger.

Rhythm Gen Section

RHYTHM (x4): Integer clock divider [1–16].
SEQ 1 & SEQ 2 assign (x4): Assign rhythm output to sequencers.

Patchbay Reference

Inputs (Normal text):
| Jack | Function | Range | |---------------------|-----------------------------------|--------------| | VCO 1 IN | VCO 1 1V/Oct pitch CV | -5V to +5V | | VCO 1 SUB IN | CV choose Sub 1/2 divisor | -5V to +5V | | VCO 1 PWM IN | PWM Mod for VCO 1 & subs | -5V to +5V | | VCA IN | VCA CV (volume) | 0V to +8V | | VCO 2 IN | VCO 2 1V/Oct pitch CV | -5V to +5V | | VCO 2 SUB IN | CV choose Sub 1/2 divisor | -5V to +5V | | VCO 2 PWM IN | PWM Mod for VCO 2 & subs | -5V to +5V | | CUTOFF IN | Filter cutoff modulation | -5V to +5V | | PLAY IN | Play/stop gate (rising/falling) | 0V to +10V | | RESET IN | Sequencer/rhythm reset/trig/hold | 0V to +10V | | TRIGGER IN | EG trig input | 0V to +10V | | RHYTHM 1–4 IN | Integer value, Rhythm (centered) | -5V to +5V | | MIDI IN | Mini-jack, Type A | — | | CLOCK IN | External clock override | 0V to +10V |

Outputs (Reverse text):
| Jack | Function | Range | |---------------------|-----------------------------------|--------------| | VCA OUT | Main Eurorack level audio out | 10Vpp | | VCO 1 OUT | VCO 1 audio/CV | 10Vpp | | VCO 1 SUB 1/2 | Sub oscillator outputs | 10Vpp | | VCO 2 OUT | VCO 2 audio/CV | 10Vpp | | VCO 2 SUB 1/2 | Sub oscillator outputs | 10Vpp | | SEQ 1 OUT | Seq 1 CV out (follows quantize) | -5V to +5V | | SEQ 1 CLK OUT | Seq 1 clock pulse | 0V to +5V | | SEQ 2 OUT | Seq 2 CV out (follows quantize) | -5V to +5V | | SEQ 2 CLK OUT | Seq 2 clock pulse | 0V to +5V | | CLOCK OUT | Master clock (all sources) | 0V to +10V | | TRIGGER OUT | EG trigger pulse | 0V to +5V | | VCA EG OUT | VCA envelope CV | 0V to +8V | | VCF EG OUT | VCF envelope CV | 0V to +8V |

Voltage Ranges

Pitch CV inputs (VCO 1/2 IN): 1V/oct, -5V to +5V
PWM, Subharmonic, Rhythm inputs: -5V to +5V
CUTOFF, VCA CV IN: CUTOFF: -5V to +5V; VCA: 0V to +8V
Gate/Trigger/Reset: 0V (low), +10V (high, trigger/gate)
Audio Outputs: 10V peak-to-peak (Eurorack level)
Envelope Outputs (VCA/VCF EG): 0V to +8V

MIDI & Other Notes

MIDI input via included Type A minijack adapter: clock, note, CC messages (see manual for full CC list).
Supports just intonation and equal temperament quantization.
All functions can be decoupled from quantization/seq octave settings for advanced patching.
All internal routing can be overridden with patch cables.