I own a blackface EDP and would like to add a Parameter Button to my Pedal. I managed to reconstruct all functions Record Overdub Multiply Insert Mute Undo NextLoop with the help of: http://loopersdelight.com/tools/echoplex/echopedals.html except Parameters. I tried both 28.0k and 33.2k and also some tweaking with a potentiometer but didn't get it to work reliably. Often I'd get Overdub instead of Parameters. Has anyone succeeded? THX Bernhard