I looked but could not find mention of this elsewhere. When I play a string, with all the others silenced, I get the modulation in the overtones like there are two notes out of tune. I have high-end strings, but a low-end bass (dean edge if you must know) and the only thing I can think of is the pitch variation is coming from the pick ups. Is there a name for this? Can I do anything about it with tone control or tuning the strings differently, or should I look at replacing the pick ups?