ive had this problem, except it was nearly a semi-tone out,
I think what it is the part of the that has corroded looses some thickness,due to oxidization, and the streches a little more. while the bit that isnt as corroded looses less diameter and doesnt stretch as much. that would create un even tension, and therefore making u sound crap
am i right or am i correct
thats my two years of physics and chem, see it didnt go to waste, i may be right on, i may be well wrong, but now i have a little ribbon that says compeditor! lol
luke