Fishman ACC-FLU-P21 Phase InverterFishman's Phase Inverter push pull control allows convenient access to the out of phase tone, and includes a hidden set and forget potentiometer that also allows you to preset a blended sound even with only one volume wiring! For years, the sound of two pickups out of phase has been a staple tone for guitar players and offers a distinctive sound. For this reason, many players want it available on a switch so they engage it when desired. Because the