First of all, I didn't know if this was the right forum, but it does involve my amp. If this should be in misc. I am sorry. I got home from my band's show late last night, everything was working fine at the show. Today I plugged everything back up to jam a little, and my tuner(Sabine RT7000) wasn't muting my signal to the amp. I usually set it up like this: bass-inst. input on tuner, amp "A" output on tuner-amp inst. input. I have no clue why this wouldn't be working right... any advice is appreciated. Thanks and God bless.