Free String Synth For Windows

Full Bucket Music Nabla simulates a Korg Delta DL-50      06/03/14

Full Bucket Music tells us that the Nabla is a VST2.4 software instrument for Microsoft Windows simulating the KORG Delta DL-50 Strings Synthesizer from 1979. Is is written in native C++ code 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-Machine™

Pricing and Availability:

Free download. Donations welcome.

More information:



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