The Filter parameters precisely tailor the tonal color.
On/off switch: Turn the filter section on or off.
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.
State Variable buttons: Switch the filter between highpass (HP), bandpass (BP), lowpass (LP), or peak (PK) modes.
4-Pole Lowpass 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.
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.
Spread slider and field: Set the stereo spread width.
Envelope slider and field: Determine the impact of the envelope on cutoff frequency.
LFO slider and field: Determine the impact of the LFO on cutoff frequency.