The Filter effect provides a sinusoidal Low Frequency Oscillator (LFO) for modulating the filter cutoff frequency. The LFO section offers control over the rate, depth and synchronization of the modulation.
Adjust the Rate control to increase or decrease the frequency (0.01–100.0 Hz) of the LFO. Lower settings are slower and higher settings are faster. When Sync is on, the Rate knob switches from counting in milliseconds, to rhythmic values.
Adjust the Depth control to increase (or decrease) the amount of modulation (0–100%) of the Cutoff frequency by the LFO. Lower settings create a slight vibrato (with the rate set high) and higher settings create a wide sweep of the Cutoff frequency range.