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Mad Filter is a free VST effect by Rast Sound that combines warm and analog-like sound with advanced modulation possibilities.


  • Filter and drive circuits that are analog-like
  • Filter Type Transition — To produce distinct motions, you can transition between several filter types (lpass, hpass, bpass, notch).
  • Complex LFO Motion & Mad States — You can activate natural, complex LFO motions by clicking little circles on top of each knob, and adding randomness with the two-level ‘Go Mad’ button.

Mad Filter is now available for download for free.

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Author Isaac Elejalde

Born in Maracaibo and based in Berlin, Isaac Elejalde established himself as one of the most prolific producers on the Venezuelan scene today.

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