TTS track somehow falls off-key
For some reason, a TTS guitar track I'm working with is somehow always falling off-key. I thought it started when I built a pitch bend wheel into the beginning of a note, but now I have no clue why it's happening.
1) The pitch bend is from, let's say, 2000 to 0 (actual note key), but when that bend was put in, all the surrounding notes fell out of key.
2) I deleted the pitch bend.* Then I carefully verified (playing by ear) that each instrument track was on key.
3) I played the track from the beginning and it sounded fine.
* I also verified in the Event List that there are no remnants of the Wheel left over.
But it seems as though, during playback or jumping between a few measures (then playing), it sets something astray and the track falls off key again by 1 note or so. This is very frustrating! These kinds of glitches make me question the stability of the software or audio engine.
How do I know if there's a problem and how do I stop this from happening? Any info is appreciated. Thanks!