Hey, that's a useful tip, thanks. I'll throw in that a good way to run low voltage for those pedals that sound better with it is to use rechargeable batteries. Most of them are actually 7.2V rather than 9V even when fully charged. Of course with a lot of pedals, they don't sound good with less than 9V, so you have to figure out the preferred diet of each pedal.That's what I've found as well. His stuff is awesome with through my '71 Pro Reverb / Jaguar setup.
Oh, and a tidbit on the Distortion Pro, and maybe this has been discussed before but, run it below 9volts if you have that capability. We were running one the other night at like 4-5 volts or so, right at the edge of where it would totally die and fart out, just above that point..and it was coool. A little bit less sustain, but the sound it was making was very inspiring.