Woah... Totally different experience to mine then.
With my FX25 (old darker green one), I find it increases the low end dramatically. If you really attack the note, it goes high, but then heads really low. Almost 400w GK cab wreckingly low! Its like WeooooooHHHHHH if that makes any sense? Im actually considering moving to something that doesn't scare the hell out of me to use through my rig!
Its an insane filter.
Well you can get the DOD to produce a great dub tone if the filter doesn't "open up"...Maybe that's what your referring to?
