Today I witnessed the weirdest change that a new (or just good) string might have compared to an old one (or just bad). I have this uv70p, and before I sent to Germany for the known problems, I remembered it had killer harmonics everywhere. When I got it back and after all the repairs, it was quite good but the harmonics on the A string sucked. All the rest of the guitars gave better artificial harmonics on A. I was ready to accept it, when I thought of just changing the string. I changed the string and the harmonics came back just like that. I had read numerous posts by ppl who had the strings as the first culprit always to blame, I just hadn't witnessed this my self, in my 30 yrs long time with electrics. I had the other ibby ARZ800 with stock strings for 2 years, and I don't remember having any particular problem.