moog-spectravox

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.

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