Posted 09 February 2011 - 06:20 PM
OD pedals sound the same on all amp volumes of a SS amp, and the volume doesn't make too, too much difference on a tube amps. (On my Blackstar, the DS-2 actually sounds a little different at higher volumes, but not much.) Really it's just the nature of the breakup and just how much gain you're using that makes different pedals sound different. (e.g. fuzz pedals break the signal into square waves and generally don't add a hell of a lot of gain)
The reason you might find that OD pedals sound different at higher volumes is that tube amps with a lot of headroom need to be cranked a bit to get any sort of breakup, whereas the gain on a distortion pedal is much greater, so you'll achieve that lovely crunch regardless.
"Take that fucking sign down." -John Frusciante
"Well, it was put to me by "that guy" when I was, like, four. So I went into my parents' record collection and found a rock'n'roll compilation. And when my mom asked if I wanted to move to L.A., I said, "Yeah," because I knew that was where the rock stars were. I was seven. Then when I found punk and listened to the Germs, I started seeing how I was part of this. I remember being out on the baseball field when I was 11, and I felt like such an outsider. Standing there in right field, I started making up an angry punk song in my head, and I went home and wrote, like, 20 songs in a row. I realized it didn't even matter if I knew how to play guitar yet." -John Frusciante