Plugin interface — screenshot pending
Synthesizer

FM-4

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.

Key Features

01Four sine oscillators with ratio and offset frequency control
02Modulation matrix with 5 sources (4 oscillators + noise) and 4 destinations
03Noise generator with resonant low-pass filter and up to +48.0 dB drive
04Self-modulation capability on each oscillator via matrix feedback
05Separate controls for audio level and modulation level per generator
06ADSR amplitude envelope generator with modulation routing
07Pitch offset from -12 to +12 semitones
08Glide control for smooth pitch transitions between notes

Things to Try

  • 01Use the top numeric control in each oscillator unit to set frequency ratios relative to incoming note pitch for classic FM harmonic relationships
  • 02Route oscillator 3 or 4 through the matrix to modulate the pitch of oscillator 1 or 2 for additive complexity
  • 03Enable the noise generator and adjust the Cutoff and Q controls along with Drive up to +48.0 dB to add filtered noise texture to the mix
  • 04Set the third row attenuator in the matrix to a value greater than zero to enable self-modulation feedback on an oscillator

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FM-4 by Bitwig | Plugin Library