Afternoon Sheldon, Henry here! Today I'm noticing a white noise or hissing coming from my Combustion Bass. I hear it even when the last knob; treble control (?) is at it's center position, when moved fully clock-wise it gets even more pronounced. Tried to change the battery, and that didn't make a difference...with the volumes in the off position, you can hear it! And when I move the treble knob, to me, the last one...WITH the volumes still off, and move the control clock-wise as far to the right as it will go, it gets more pronounced! Moving it all the way counter-clockwise; it's still audible just not as much! I was not hearing it while practicing last nite...so any help would be appreciated! Combustion # 00044! Thank you so much, and good day!