Gentleman I didnt find a clear cut answer in the search. I have recently done some Duncan preamp installs and separated the contour slap from the push pull on the volume and added an active/preamp bypass switch. I do have the cavity shielded with copper foil and wired correctly and grounded correctly. My issue is the active/bypass switch the first time you switch either way there is a loud pop I cant seem to get rid of. I know how to add two resistors on a push pull mid knob but this has me perplexed. Anyone know what to do ?