Feldspar is a virtual analog synthesizer (made with SynthEdit) featuring a range of tempo-based modulation options.


  • 16 LFO waveforms
  • Ring modulator with 18 algorithms
  • Tempo-synced delay with high and low pass filters in the feedback path
  • Drift function for controlling oscillator pitch instability

Feldspar costs $16.95 which also includes FeldsparFX, a VST effect plug-in based on Feldspar’s architecture. A demo version is available at Contralogic; it is fully functional except the output periodically drops to silence.