I use a boost at the end of my chain just to help "boost" anything i lost on the way. plus it helps me use less Gain on my amp, which could get dirtier than desired. now, obviously, a boost will help raise overall volume. however, when mine is engaged, i get a quite noticeable noisy hiss. and my pot is only at 3 o'clock. is that normal with boosts? i'm using an MXR ISO Brick on all of my pedals. and that's the only one that gives me a loud hum when used.