What's the difference? What i'm hearing is a high-pitch alternate note, almost 'harmonizing' (but not in a pleasing way!) with the note i am playing. It is predominately occurring when i am playing high-register (single) notes on the B string... It's coming from a pair of (older) Mojo Ceramic 10's, and they would definitely be 'broken-in' by this point... Thanks for your help!