I rolled back the driver to 2.01 and 2.10, there was a mute on the tuner release so it didn't blast the usb driven signal like the current firmware (2.20). But if you turn down the computer sound before using the tuner function, the noise will only be as loud as the computer volume (which is driving the Line6 sound driver). I've found that "ALL THE WAY DOWN" (MUTE) is the best position until this issue is resolved.
