Just taken delivery of a mustang I v2 today and it’s making a strange high pitched whistle and hum before I plug anything in. Soon as I connect a guitar the high pitched sound gets much louder as does the hum and it’s unusable. While I play it sounds ok as it drowns out the noise but as soon as I stop it’s really uncomfortable.
I have switched guitars, cables and updated the firmware to 2.2 but no difference. Have I got a dud?
Tried all different presets too and the noise gets quieter on some but it’s still there and very noticeable. I have. Cheap Epiphone amp and that’s silent while I’m not playing so this can’t be right.
any ideas?
Thanks
Chris
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