FM-4

Synthesizer
Bitwig

FM-4 is a four-oscillator FM synthesizer that uses frequency ratios with offsets to set oscillator pitches, offering a modular and hands-on approach to frequency modulation synthesis. It features a dedicated noise generator with resonant filtering, optional self-modulation on each oscillator, and a comprehensive modulation matrix for routing modulation between all generators. The distinctive design emphasizes ratio-based pitch control and explicit modulation connections, making FM synthesis concepts visually transparent and editable.

Available for:VSTVST3AUAAXCLAPSTANDALONE

Key Features

  • Four sine oscillators with ratio and offset frequency control
  • Modulation matrix with 5 sources (4 oscillators + noise) and 4 destinations
  • Noise generator with resonant low-pass filter and up to +48.0 dB drive
  • Self-modulation capability on each oscillator via matrix feedback
  • Separate controls for audio level and modulation level per generator
  • ADSR amplitude envelope generator with modulation routing
  • Pitch offset from -12 to +12 semitones
  • Glide control for smooth pitch transitions between notes
User Manual

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