I get a weird noise when raising or lowering the volume knob on my AxeFXII thru my speakers. It's like a clicking, pulsing noise that's quite ugly but it doesn't really affect me all that much so I never brought it up. It's been like this since the day I got it. Is this normal? Does anyone else experience this noise? Still sounds killer but I always though it was a bit strange. Not sure is something that needs to be taken care of.