Stigma – a free software synth that simulates the KORG Sigma KP-30

Full Bucket Music has released the Stigma, a VST 2.4 software instrument for Windows (32 and 64 bit) that simulates the KORG Sigma KP-30 Performing Synthesiser from 1979…


Main features

  • Nineteen Presets with individual filters, envelopes, and amplifiers
  • Two band-limited oscillators with four footages (32′, 16′, 8′, 4′)
  • Synth preset section:
  • Eight presets including Noise and Ring modulator
  • Individual lowpass and global highpass filters
  • Instrument preset section:
  • Eleven presets, Delayed Vibrato effect

Effect section:

  • Portamento, Quarter Tone, Keyboard Sensor (aftertouch) and more

Tweaks (not to be found in the original Sigma):

  • Up to 64 voices polyphony with Velocity
  • Chorus/Ensemble section
  • Preset editor

MIDI Learn – all parameters can be controlled by MIDI CC
40 additional presets by kraftraum
Double precision audio processing
Plug-in comes in 32 bit and 64 bit versions
Fully compatible with SM Pro Audio’s V-Machine


You can download Stigma for free here and if you’d like to support the developers than donations are welcome too.