Bastl Instruments Dark Matter, High Energy Sound Processor, Now Available

The latest concoction from Bastl Instruments and Casper Electronics brings audio feedback to your eurorack synth setup. Go as crazy as you wish while making the output playable.  

Bast Instruments and Casper Electronics are proud to present the newest member of our modular family. Meet Dark Matter, a high energy sound processor and signal generator that unleashes the crazy raw power of audio feedback into your eurorack system.  It’s inspired by “no input” mixer feedback techniques that explore the complex natural behaviors of amplifier circuits pushed beyond their limits. Dark Matter brings this behavior to the modular synth, adds voltage control to everything, tons of patching options and a big ol’ bag of tricks for making feedback a truly *playable* effect.


  • Excite audio signals to the breaking point with 4 flavours of voltage controlled overdrive.
  • Turbo charge percussive hits and drum beats.
  • Add sub-octave tones and timbrel richness to melodies and bass lines.
  • Tweak your tone with a crunchy overdriving 2 band EQ.
  • Add signal ducking and gating effects with the built in envelope follower.
  • Go the feedback way and create meandering loops through your rack using the 10 I/O jacks…..Feedback your feedback your feedback.
Bastl Dark Matter eurorack module


  • Input VCA with gain and soft clipping
  • 2 band equaliser with voltage controlled bass and treble boost/overdrive
  • Voltage controlled feedback
  • External feedback section for making and fine tuning loops through other modules
  • Voltage controlled crossfade between input and feedback signals
  • Input tracking envelope follower for adding ducking and gating effects
  • 10 I/O jacks for adding CV and making crazy loops


  • 13 HP
  • PTC fuse and diode protected 10-pin power connector
  • 24 mm deep
  • power consumption +12V: < 75mA; -12V:

Rounik is the Executive Editor for Ask.Audio & macProVideo. He's built a crack team of professional musicians and writers to create one of the most visited online resources for news, review, tutorials and interviews for modern musician and producer. As an Apple Certified Trainer for Logic Pro Rounik has taught teachers, professional... Read More


Want to join the discussion?

Create an account or login to get started!