Having read LOTS of threads about LOTS of stuff for quite some time, I'm ready to ask what's likely to be a rather naiive question? Why can't I discern an appreciable tonal difference between my Timmy and Zendrive pedals? (And, no, I don't wan't to sell them.) Regardless of guitar (PRS, LP, Strat or Tele) and pup choices (SC or HB's), playing into a Mojave Coyote that's got decent tubes (Amperex, Telefunken) it's difficult for me to find a distinct difference in tonal character between the two. The amp is very JTM-45 or even Marshall 18W-like all on it's own. Is it that the tubes are already breaking up with higher output so the push from the pedals are not as noticeable? But even when backing off on the independently-voiced Bass and Treble knobs to clean the amp up, I still have trouble hearing any difference between the two. Sure, I can have the gain of one cranked and the other barely discernable but then reverse the two and not notice it. I read about all the ways we describe a sound (smooth, creamy, gritty, etc) from one pedal or another but in this case I think I could switch guts for Zendrive and Timmy and I wouldn't know any different.