Moog Spectravox
10-band analog spectral processor and vocoder
60 HP Eurorack module
Spectravox is a semi-modular analog spectral processor built around a 10-band resonant filter bank inspired by the Wendy Carlos/Bob Moog vocoder design from the early 1970s. It functions both as a standalone synthesizer voice with a sculptable frequency spectrum and as a full 10-band vocoder with integrated modulation. All 10 synthesis filters can be shifted simultaneously across the frequency spectrum via the Spectral Shift control and its dedicated LFO, creating phaser-like sweeps and otherworldly spectral animation impossible with traditional fixed filter banks. The module includes a VCO (saw/pulse), white noise generator, program input with preamp, envelope generator, and 36 patch points for deep Eurorack integration.
Features
- 10-band analog spectral processor and vocoder
- Voltage-controlled Spectral Shift moves all 10 synthesis filters simultaneously
- Dual filter banks: analysis (fixed) and synthesis (shiftable)
- Built-in VCO with sawtooth and variable-width pulse waveforms
- White noise generator with crossfader carrier mix
- 10 individual envelope followers with CV outputs
- 10 individual VCA CV inputs for per-band level control
- Bands 9 & 10 Hiss/Buzz mode for improved speech intelligibility
- Integrated triangle LFO with rate from 0.05 Hz to 500 Hz
- Decay-only envelope generator with trigger button
- Program input with XLR/1/4" combo jack and preamplifier
- Hold function freezes all envelope followers for vowel capture
Controls & Jacks (60)
- VCO Wave
- Pulse Width
- Spectral Shift
- Shift LFO Rate
- Decay
- Volume
- Gain Level
- VCO Freq
- Carrier Mix
- Resonance
- Shift LFO Amt
- Gain LED
- Prog Trig -> EG
- Hold
- VCA Mode
- Mode
- Bands 9 & 10
- Trigger
- 1 Level
- 2 Level
- 3 Level
- 4 Level
- 5 Level
- 6 Level
- 7 Level
- 8 Level
- 9 Level
- 10 Level
- 1 VCA CV
- 2 VCA CV
- 3 VCA CV
- 4 VCA CV
- 5 VCA CV
- 6 VCA CV
- 7 VCA CV
- 8 VCA CV
- 9 VCA CV
- 10 VCA CV
- 1 ENV F
- 2 ENV F
- 3 ENV F
- 4 ENV F
- 5 ENV F
- 6 ENV F
- 7 ENV F
- 8 ENV F
- 9 ENV F
- 10 ENV F
- Program In
- VCA Out
- 1V/OCT In
- VCO Out
- VCO PWM In
- Noise Out
- LFO Rate CV In
- LFO Out
- Trigger In
- EG Out
- Shift CV In
- Hold Gate In
How-To Guides
- Sci-Fi Ambient Drone
- Classic Voice Vocoder
- Percussive Filter Pings
- Drum Machine Vocoder
- External Signal Processing
- Frozen Vowel Pad
Explore the interactive Spectravox panel on BleepDex — tap any control to learn what it does.
