I did a search, but there wasn't much and none of it conclusive. I was wondering if underpowering a digital effect like a reverb stompbox would harm it? It seems not to be a problem with analog (what with the prevalence of "starve" knobs on modern effects) but I was interested in experimenting with my Boss RV-2 to see if underpowering it can give it even more of a lo-fi feel and add random artifacts and such. It's my only pedal, though, and I don't want to track down another one! It runs on a 9v adapter (no battery) with a relatively high draw of 130ma.