hey! just a little problem that has been bugging me for ages! I have a tanglewood curbow 4, plays perfect. But when i tune the strings E, A and G and move down to the other frets when pluged into the tuner, i notice the note goes a little bit sharp.(not much but a bit) infact the futher i go down the frets the more out it is! i've tryed moving things around a bit, and i changed strings but cant think of anything else that it could be? the funny thing is, the D string stays in perfect all the way down to 24 any ideas anyone? thanx!!