Free Soft Synth Emulates Rare Korg PS-3300 Polyphonic Analog Synthesizer

Free Music Software: Full Bucket Music has followed up their virtual Korg PS-3100 with FB-3300, a free software emulation of the rare KORG PS-3300 polyphonic analog synthesizer.

The FB-3300 is a software instrument for Microsoft Windows (VST) and Apple macOS (VST/AU), simulating the KORG PS-3300 synthesizer from 1977. 


  • Emulation of behavior and controls of the original hardware
  • Three independent polyphonic synthesizer blocks
  • Band-limited oscillators, classic two-pole lowpass filters
  • Resonators section plus two Modulation Generators per bank
  • Additional Sample & Hold and paraphonic Envelope Generator
  • Semi-modular
  • Micro-tuning option
  • Additional tweaks
  • MIDI Learn – all parameters can be controlled by MIDI CC
  • Plug-in supports Windows and macOS (32 bit and 64 bit)

Audio Demo:

Pricing and Availability

FB-3300 is available now as a free download for Mac OS X & Windows.

If you’ve used FB-3300, leave a comment and share your thoughts on it!

16 thoughts on “Free Soft Synth Emulates Rare Korg PS-3300 Polyphonic Analog Synthesizer

  1. BTW, in case anybody else gets deja vu: Full Bucket’s PS-3100 emulator was mentioned here back in September, this is for the version that emulates the PS-3300 – pretty much 3 PS-3100s stacked together.

  2. I knew almost nothing about the Korg PS series (or the Sigma, for that matter) until i tried these Full Bucket synths. They really are breeds apart from the more simplified Prophet, Juno/Jupiter, and OBX-type architecture. Not sure how accurate the emulations are but I’m not even concerned about that, considering how much fun i’m having with them.

    1. The PS modular line appeared around the same time as the MonoPoly, so from my experience with that, I’d say the emulation is pretty good here. The Korg filter from this period is not at all Moog-like. Its a bit more sharp, with a non-distorting, slightly-grainy feel to it. Korg’s Legacy MonoPoly is a bit like Full Bucket’s PS models: everything you like about the original hardware, magnified. (+100 for the patch memories!) I bet they’ll make a great pair.

    1. Did you copy the .component file from the downloaded folder into your Library/Audio/Plug-ins/Components folder? I have no problems here…

      1. Yes, I copied both the .component and .ini files into Library/Audio/Plug-ins/Components. Downloaded the plugin again and tried reinstalling it, but still have the same problem.

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