I have not tried the tuner at the end of the chain. SInce the issue happens with just the wah alone I'm ruling out the chain. It's not the muffled tone I'm concerned about, it's literally where the cross over from muffled to bright occurs. I have been experimenting with different guitars/pups. I've noticed a BC I have (ST-3) the "screamin' demon pup I put in as well as the single coils all seem to sound fine as do the Phat Cat P-90s I put in a 06' LP Special. I bought a 60s reissue Standard a couple years ago with Burstbuckers and it gets this at that midway point? Wasn't sold on the Burstbuckers from the start (ice pick high E) so may be looking to swap them as well. Still work in progress haha. Thx, Dale