What is Girthy Hertz?

Girthy Hertz is FREE a polyphonic, standalone synthesiser that features a powerful mapping system for generating audio from interactive and generative systems.

Works with Tekh Tonic

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Get Tekh Tonic


  • 149 mappable parameters for extreme automation
  • 8 LFOs
  • 4 oscillator modules, with mixable sine, triangle, saw and pulse waveforms
  • 2 routable filters
  • Parameters can be mapped to each other, MIDI and OSC input, or signals ( like LFOs and envelopes )
  • Mapping system includes scaling, smoothing, limiting and inverting processes
  • Notes can be generated from continuous data or from input triggers or toggles



( optional donation ) We give 10% of all donations for this product to the EFF.

Current build: v0.902 beta  Date: 02/11/2014

Download “Girthy Hertz WIN” Girthy_Hertz_v0.902_beta_WIN.zip – Downloaded 1051 times – 14 MB

Download “Girthy Hertz OS X” Girthy_Hertz_v0.902_beta_OSX.dmg – Downloaded 1091 times – 41 MB

For help or to report bugs, head over to our forums page or contact us.

v0.902 beta

Initial Release