Free Audio Filter Plugin, Mad Filter, For Mac & Windows

Rast Sound has released Mad Filter – a free software effect, designed to combine warm and analog-like sound with complex modulation options.


  • Analog-like Filter & Drive Circuits
  • One-of-a-kind Filter Type Transition – You can transition between different filter types (lpass, hpass, bpass, notch) to create unique movements.
  • Complex LFO Motion & Mad States  – You can click small circles on top of each knob to trigger natural, complex LFO movements and further add randomization with 2 level ‘Go Mad’ button.

Mad Filter is available now as a free download.