I have an Ernie Ball volume pedal - the big, 250K, mono, passive model. I put the pedal in a true bypass looper and played while taking the pedal in and out of the chain... definite loss of high end with the toe in the down position. No real surprise there... but what did surprise me is that I also lost some volume. And I suspect that the treble loss was due to the pot not quite getting full rotation in the tow down position. So, I took the pedal apart... removed the spring and strings. I put it back in the loop and manual set the pot to full volume. No tone loss to my ears! I think the issue was with my pedal specifically (although a lot of users report the same problem) because my pedal also never fully turned off in the toe up position. Anyway, just an observation. I think the EB is a good pedal... if it's set correctly so that the pot rotates fully. And here's my question: I want to use a volume pedal for swells. I plan to buy the 25K VP Jr. and run it first in line in my FX loop. I read a lot of threads where people said use a buffer before the volume pedal to compensate for tone loss. Is that necessary in an FX loop? Aren't FX loops already buffered?