Did some searching but didn't find anything addressing this specifically right away. I just picked up a used (one year old) ART tube mp Studio for my own vocals to warm them up a bit. I've done some testing just through a small mixer at home with headphones, and running a mic in and out of the ART mp into the mixer using mic/XLR cables, there is a good amount of noise. I tested running the mic straight into the board with each cable solo, and both are silent. Running a bass through the 1/4" in/out to the board is silent, too. It's just using XLRs that is noisy, and it seems to be tied directly to the volume control. If I crank the input gain and keep the volume below 9 o'clock I can minimize the noise while keeping a unity signal, but there is still some white noise there. I have read on other forums that using a short, high quality mic cable from the ART to the board will help. But that kills my idea of mounting it to my pedal board where I can control it and power it. Anyone else have this issue with the output?