Ok, here are two situations I am in right now that may screw up my amp (btw my amp is a hartke b90). Situation #1: Whenever my pedal is turned on (a Boss ODB-3) and i am not playing anything, my amp makes very loud shrieking noises. And its really hard to stay next to my pedal the whole time and turn it on and off when im not playing. Will the shrieking noises eventually screw up my amp? What can i do to not make it shriek? Situation #2: Like some of you guys, I am also a guitar player. I play bass more often than guitar, and now that im also in a band where i play guitar, I use my bass amp for it since it is the only amp i have that is loud enough. Can playing a guitar on a bass amp screw up my amp also?