Ok, weird question. I've been playing my recently acquired Fender Pro P bass and I'm noticing when the tone control is turned down, notes fretted on the A-string sound flat to my ear but intonation and tuning all check out and are to pitch (A=440Hz). When I open up the tone all the way, it sounds fine. I initially thought I may be pressing too hard on the tall narrow frets but that would make the note sharp not flat. Is it possible for a string/note to be tuned to pitch while the overtones are either sharp or flat when it's intonated correctly? It's happening with both the original set of roundwound strings and a new set of flatwounds.