Each of the four filters has the same parameter set with values selected by the same principles. Filter-related parameters start with #F1_, where 1 is the filter's number in the signal chain.
The whole set of parameters for a single filter looks like this:
#F1_BLEND controls the mix of the dry and filtered signals. At 1.0, the filter is used to the fullest (12dB/Oct); at 0.5, it is used at half the depth (6dB/Oct); at negative values, the filtered signal is subtracted from the dry one (the effect of the filter is inverted).
#F1_SCALE controls the scalar range of the LFO's effect on the filter. At 1.0, the range is 100%; at 0.5, the range is 50%; at 0.0, the filter is static (the DEPTH knob has no effect on filter cutoff frequency). You can use values over 1.0 (but preferably under 2.0) to increase this range, as well as negative values to invert the LFO-controlled movement.
#F1_BIAS shifts the filter frequency set by the BASE knob. It is recommended to keep this parameter's value under 0.5. Under certain conditions, this parameter can filter out all of the signal, causing it to go silent. The accepted value range is 0.0 to 1.0 (0.125 = 900Hz). To make a filter static (not affected by the LFO), set this parameter to the needed value and set the #F1_SCALE parameter to 0.0.
#F1_MIX_LPF controls the mix of the resonant LPF with the dry signal. The value range is 0.0 (0%) to 1.0 (100%). Negative values are also accepted.
#F1_MIX_HPF controls the mix of the resonant HPF with the dry signal. The value range is 0.0 (0%) to 1.0 (100%). Negative values are also accepted.
#F1_MIX_BPF controls the mix of the resonant BPF with the dry signal. The value range is 0.0 (0%) to 1.0 (100%). Negative values are also accepted.
It is possible to select the mix values by ear, although it can yield unpredictable results (particularly with negative values involved). For a start, it may be easier to use only one filter type in the mix before experimenting with the rest.
#F1_Q controls the filter's resonant peak. The value range is 0.001 to 1.0. The lower the value, the higher the peak: +3dB at 0.75, +6dB at 0.5, ~+11dB at 0.25, ~+16dB at 0.125. It is recommended to keep this value over 0.08.
The pedal has four resonant filter sections. You can turn each one on and off independently, as well as set individual parameters for each of the filters. Experiment away!