my ac30cc is acting kind of weird lately. whenever i play up high theres a quite noticeable undetone. it's distorted and about an octave lower than the original note. it starts on about the 7th fret on the high e and the 12th on the g and b and continues the rest of the way up the fretboard. that leads me to believe it's not cone cry, right? could this be the famous vox ghost note? it's really quite annoying and makes soloing pretty unpleasant. i'm thinking that this is either the ghost note or a fault in the amplifier. has anyone experience anything like this? i've changed tubes and messed with the smoothing and bias settings on the back and nothing has helped. this is very frustrating. please help me.