Full Bucket Music has released Nabla, a free VST instrument synthesizer for Windows simulating the KORG Delta DL-50 Strings Synthesizer from 1979. Nabla is designed for high performance and low CPU consumption.


  • Paraphonic Synthesizer and Strings sections
  • Up to 64 voices polyphony
  • Synthesizer section:
    • Four band-limited frequency divider-driven signal generators
    • Additional noise generator
    • 4-pole zero-delay feedback bandpass/lowpass filter
  • Strings section:
    • Two band-limited frequency divider-driven signal generators
    • 2-band equalizer
    • Ensemble effect
  • Flexible pitch/filter modulation by LFO or noise
  • Tweaks (not to be found in the original Delta):
    • “GOD Mode” to provide true polyphony
    • Panning for Synthesizer/Strings sections
    • Built-in phaser and delay effects
  • Double precision audio processing
  • All parameters can be controlled by MIDI controllers
  • Plug-in comes in 32 bit and 64 bit versions
  • Fully compatible with SM Pro Audio’s V-Machineā„¢


Nabla is available at no cost.

More info: Nabla free VST instrument synthesizer

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