I just picked up my guitar a little while ago and it was one of those days where my setup (not me) just sounded terrible. It's one of those rare days where no matter what you do to get a good tone out of your rig, you just can't. I wound up giving up about a half an hour into it and had to sit my guitar back down in frustration. Today was one of the worst and least inspiring tone days I've had in a good while. Everything just seemed so stiff, lifeless and soulless sounding. It seems about once or maybe twice a year I get a day like that where, for whatever reason, everything just sounds flat. I've wondered if varying voltage from the wall has anything to do with it? I've also heard theories about changing humidity/air densities and whatnot too. I've always wanted to try a voltage regulator with my guitar amp though. Anyway, have you ever had one of those days where you just had to give up because it just wasn't doing anything for you?