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SoedeSoft SidMaster

SIDmaster Synthesizer


  • • Emulates the sound of the Commodore 64's SID 6581.
  • • 3 voice polyphonic synthesizer or monophonic mode.
  • • Arpeggio / wave patterns effects, LFOs.

Audio examples

SIDmaster is a virtual synthesizer emulating the SID 6581 sound chip of the popular Commodore 64 home computer of the eighties and nineties. The SID 6581 was capable of producing sounds many years ahead of any other computer at the time. SIDmaster has 3 voices which can be used to create monophonic sounds with 3 layers, or the it can operate in (3 voice) poly-phone mode using single layer sounds.

Although the synth looks compact and doesn't take much space in your rack, all registers of each of the 3 voices can be controlled simultaneously.

Besides simply emulating the SID chip, it also implements all kinds of effects that were popular in the days when musicians made game or demo tunes for the C64, to get greater sounds.

Product details

The C64 6581 SID chip has 3 voices, each voice has

  • Attack Decay Sustain Release control.
  • Waveform selection (triangle, sawtooth, pulse, noise, or any combination)
  • Pulse width can be modulated by the control wheel.
  • Built-in arpeggiator, which can be different per voice
  • Waveform effects (alternates waveforms/frequencies sequentially)
  • Ring modulation and synchronization options (modulates / synchronizes one voice with another)
  • Note transpose and detune

One filter which can be enabled per voice

  • it can be configured as lowpass, highpass, bandpass or notch filter
  • Cutoff frequency, and resonance, which can be modulated by the control wheel and velocity.
  • Resonance can be modulated with the control wheel.
  • LFOs for the pulse width, frequency of each voice and one LFO for the filter.

Playmodes are

  • Monophone: use all 3 voices simultaneously to create richer, layered sound
  • Polyphone: operate as a 3 voice polyphonic synthesizer.
  • Keyboard control: pitch bend, legato / slide



Released: 2020-01-17
Version: 1.0.6