Reference:Tweaking Tones
Attack – controls how long it takes for the effect to happen.
Pos – represents the current angle of that pedal, with 0% meaning the pedal is fully heel down, and 100% meaning it’s fully toe down. If you don’t have a pedal connected, you can still adjust Pos to get a “parked wah” sound.
Heel – sets how much effect you’ll hear when the pedal is at its minimum (heel down) setting. Set it to 0% to have no effect in the heel down position.
Toe – sets how much effect you’ll hear when the pedal is at its maximum (toe down) setting.
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