On/Off buttons: Enable or disable each filter (1, 2, or 3).
Filter type pop-up menu and field: Choose the filter type. Use the descriptive names Clean, Edgy, Gritty, Rich, Sharp, and Smooth to make a choice that is right for your sound. You can step through the available filter types with the Previous and Next buttons (the arrows).
Ser/Par buttons: Set the filter routing configuration. Series runs from the first filter into the second filter. Parallel runs the two filters side by side.
Cutoff knob and field: Set the cutoff frequency for the chosen filter type.
Resonance knob and field: Boost or cut frequencies above, below, or surrounding the value set with the Cutoff knob. Resonance behavior varies among filter types.
Drive knob and field: Overdrive the filter. This can lead to intense distortions and aliasing, depending on filter type.
Send knob: Set the level of the source output (post source filters, if used) sent to the destinations specified with the Send pop-up menu.
Send pop-up menu: Determine where the source output is sent (post source filters, if used).
F1/F2: Source output is routed to main filters (1 and 2). The balance between these targets is set with the Send knob.
F1/FX A/B/C/D: Source output is routed to main filter (1) and effects rack A, B, C, or D. The balance between these targets is set with the Send knob.
F2/FX A/B/C/D: Source output is routed to main filter (2) and effects rack A, B, C, or D. The balance between these targets is set with the Send knob.
Note: Signals sent to effects rack A, B, C, or D destinations bypass the main filters when the Send knob is set to the full-right position. See PDF
Control Surfaces Support Guide: PDF