My Mutron III+ overdrives when i'm playing anywhere on rhe g string and anything higher than the 9th fret. I have a 24V adapter. this happens with both my stingray and my jazz. i haven't been palying shows in a year so the only amp i have is a GK backline 12 that i use as a practice amp. could it be the amp? it sounds pretty damn good when it's not overdriving though..... Mutron III+ your days are numbered unless someone here can save you!!!!!!!