What I don't quite get is how the computer usb port is lifted as the comp is still plugged in (due to no battery life).
The computer is plugged into a power adaptor which may or may not have an earth connection. Good luck trying to solve this one. Sometimes it happens on stage, guitar processors are the worst. It's hard to do anything about it especially in a hurry.
If that was the case removing the computer from the outlet and running it on battery would sort the problem?
On a guitar I guess even the person holding it can work as a 'ground loop'? specially if bare foot... :D
@Airhead started
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What I don't quite get is how the computer usb port is lifted as the comp is still plugged in (due to no battery life).