The Filter parameters allow you to precisely tailor the tonal color.
Filter parameters
Cutoff knob and field: Set the cutoff frequency for the filter. Higher frequencies are attenuated, whereas lower frequencies are allowed to pass through in a lowpass filter. The reverse is true in a highpass filter. When the State Variable Filter is set to bandpass (BP) mode, the filter cutoff determines the center frequency of the frequency band that is allowed to pass.
Resonance knob and field: Boost or cut signals in the frequency band that surrounds the cutoff frequency. Very high Resonance values cause the filter to begin oscillating at the cutoff frequency. This self-oscillation occurs before you reach the maximum Resonance value.
Fatness slider and field: Boost the level of low frequency content. When you set Fatness to its maximum value, adjusting Resonance has no effect on frequencies below the cutoff frequency. This parameter is used to compensate for a weak or “brittle” sound caused by high resonance values, when in the lowpass filter mode.
State Variable Filter buttons: Switch the filter between highpass (HP), bandpass (BP), or lowpass (LP) modes.
4-Pole Lowpass Filter buttons: Set the slope of the lowpass filter to 6, 12, 18, or 24 dB per octave.
Note: Clicking one of these buttons automatically chooses the lowpass (LP) filter and slope, overriding any active State Variable Filter button.