Re: The pedal demo page (BOSS)
The MT-2 is VERY sensitive to the slightest change in any of the knobs on it. It works best into a completely clean sounding amp, but I never had any problem reproducing the distortion sounds that they have on the website with a guitar with humbuckers. I prefer to use the DS-1 with a slightly overdriven amp, but don't get any buzziness once it's dialed in properly.
Try using the pedals with a Fender tube amp, a Roland Jazz Chorus, or somthing similar. If the distortion you're getting is really buzzy, try playing with the mid range tone control of the amp and you should be able to get rid of it. Make sure that the volume is up on the amp (pedals sound completely different through loud amps than quiet ones). Last of all, try turning the gain down . . . I find that any super saturated sound (from an amp or a pedal) is tinny, fuzzy, and sounds like it's through a practice amp. Hope that helps . . .