The filter controls provide full access to all of FabFilter Micro's filter parameters.
The Frequency knob sets the cut-off frequency of the filter over the entire audio range.
The Peak knob adjusts the resonance of the filter. A little resonance will cause the filter to
create warmer and more characteristic tones. At maximum resonance, the filter will
self-oscillate at the center frequency.
The Response buttons select between low-pass and high-pass filter shapes. FabFilter Micro's
filter always has a 12 dB/octave steepness.
At the far left, the Level knob sets the amount of filter frequency modulation with the
built-in envelope follower. You can set both negative and positive modulation. In the center
position, no modulation will take place. The little reset button at the top of the level knob
lets you easily turn off modulation altogether.
The Speed knob adjusts how quickly the envelope follower reacts to changes in the input signal.
When turned all the way to the left, the envelope follower reacts quickly and aggressively to
changes. When turned all the way to the right, the response to changes is very slow and smooth.
The default position in the center provides a good overall behavior.
Tip: the EF light above the envelope follower controls shows you how much
filter frequency modulation is currently taking place.