Windows XP, BiaB 2010 build 294. Eiderol driver to/from midi (Yamaha Clavinova) keyboard.

Trying to record my own piano to, oh, let's say "Laura." Moderate bossa. No real tracks. No RealDrums. BiaB piano, guitar, strings all muted. Mostly spare playing with occasional very full block chord figures. Sounds fine through the instrument while I'm playing/recording.

However, several times during three choruses a whole chord is captured as lagging my actually played notes by 15 or more ticks, as shown by "edit-note" off the annotation view. Needless to say, it sounds sloppy. Repositioning notes is (a) laborious and (b) indicative that something's wrong with the program or the setup.

What's going on?
Thanks for any help.


-Mel