Eh Gr3y, many pedals can be run @ 18V.   :wink: 
Ark, the noise issue only occurs with certain pedals... not necessarily with hi gain stuff.
I had the issue while using 1 x 1Spot, when I had my hellbilly and CE-2 on at the same time.  I would hear a nice swirling chorus when I wasn't playing. 
Anyway, getting a looping system would actually cut off a lot of noise (if there is noise int he first place) since ppl usually group modulation efx together in 1 loop and dirt pedals in another loop.