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Mercury Filter (beta)


screenshot An analog sounding lowpass and highpass filter based on the classic "Tethys" filter for Jeskola Buzz. Watch out using this in real productions as future versions will have more parameters, and thus, will not be parameter compatible with this one.

Known limitation: The LFOs are sort of an extra feature, and when activating just one of them, the engine switches to a different mode that uses far more CPU.

It's still a beta version, and some functionality is missing such as the phase knob, tempo sync is missing. The plug-in has been tested at 44100, 48000 and 96000 Hz samplerate, but should work at other rates as well.

Features being considered: Tempo sync. Envelope follower. Switch between different sonic characters. Wide-range switch knob for 10 - 40000 Hz range.

Windows VST 32/64-bitv106Download
Apple AudioUnit 64-bitv106Download
Apple VST 64-bitv106Download


Version history

  • v106: Added activity LEDs.
  • v105: Changed signal path for better highpass filter behavior.
  • v104: Fixed crash when exceeding the nyquist frequency. Reduced clicks when changing filter steepness.
  • v100: Completely rewrote and optimized both the butterworth filters. Much better performance when not using the LFOs. Filter frequencies should also be more precise now.
  • v86: Nicer knob design. Hold down Alt to fine tune. Hold down Ctrl to reset to default.
  • v84: Better LFO modes and names. Fixed bug where the two first LFO modes would go out of phase sync.
  • v83: Less clicking when switching lowpass mode. Added a "fractal" LFO shape out of sheer curiosity.
  • v82: First rudimentary LFO added.
  • v80: Slightly nicer graphics. All parameters now exposed internally (so that future versions will be compatible with saved presets), but LFO and filter link still missing.
  • v78: First unofficial beta release with many features and UI elements missing.


Website by Joachim Michaelis