This looks like the thing for my Dean Edge 6 string fretless with stock crapo electronics. It came with 4 pots (Vol, Pan, Bass cut/boost, Treble cut/boost) and no extra charge for scratchy pots. The ACG filter circuit replaces the electronics but attaches to the stock pickups(EMG's in the Dean). It has 2 low pass filters with variable boost (Q?) on stacked pots, Vol/Pan on a stacked pot, and a treble hi-pass filter with boost also on a stacked pot. The circuit comes with 2 sets of knobs - black and silver for USD $397.15 shipping included to the USA.
Kris