That didn't work - I went to controllers and set it up this way: Model=Brit J-800, Parameter=drive, FS Assign=EXP TOE SWITCH, CONTROLLER=EXP-1. Minimum 17%, Maximum=27% (these settings are 'White' on the controller page). I also tried adding a volume/pan pedal after the mixer to the effects...no go - could my HD 500 possible have a defective expression pedal?