Mine has a problem also. The right-hand sound starts behaving as if the pitchbend wheel is engaged, even though it isn't. You must manually move the the wheel up and down to make it stop. At first it did it occasionally. Now it does it increasingly more and more, as much as once or twice PER SONG.
Mine was damaged in shipment slightly, and maybe that has something to do with it. At any rate, George Kaye is replacing it as soon as he gets another in stock.
Yay George!!! Wonderful service!
DonM