I've pretty much made up my mind in that the Cafe Walter is the right headphone amp for me, but another question just popped into my head that I can't seem to find the answer to. Has anyone put thier effects chains or preamps into the Cafe Walter? Any clipping going on when an input hotter than an instrument is used? I've seen that users are having no problems with thier 18v basses, but no mention about the pres. edit: I didn't really specify onboard vs outboard pres. I'm curious about outboards like the Avalon, Ampeg, etc.