Interstellar Radio Eurorack Module Hands-On Demo

Developer Eric Schlappi (Schlappi Engineering) shared this video demo of his Interstellar Radio Eurorack synthesizer module

The Interstellar Radio is designed to be used as both an audio source and as an effect. It works by modulating the input frequency with a carrier into a high frequency pulse train and then demodulating it back into an audio signal, with separate voltage controls over each frequency.

Manipulating the clocks allows for a variety of aliasing, distortion, and frequency modulation type effects. The output is also sent to a comparator along with the input, and the result is available at the “ERROR” output for a ring modulation type effect.


  • Simulates the process of modulating and demodulating a signal for radio transmission
  • Effect or complex oscillator (non v/oct)
  • Voltage controlled aliasing, distortion, and frequency modulation effects
  • Two wide ranging voltage controlled square wave oscillators with individual outputs
  • CARRIER oscillator converts input into high frequency pulse train
  • DEMODULATOR oscillator inside control loop brings sound back to audio range
  • CV applies external voltage control to oscillators or uses input signal as audio rate FM
  • Internal oscillators can be replaced with external modulation sources
  • TYPE selects demodulation loop type (changes timbre and response)
  • ERROR output with threshold control
  • TONE control for filtering out the harshest of frequencies
  • All analog design

Schlappi is also featured in an interview about the new module, by Ross Fish of Moffenzeef Modular.

Price and Availability

Interstellar Radio is available now to pre-order for US $199 and is expected to ship by the end of the month.

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