I had emailed M-Audio about the 2GB split function, asking about whether they would be working to fix the WAV function:
[A R -- 03/09/2006 03:00]
No, there will never be the ability to record more than 2 gigs at a time.
This is a limitation of the file format used (Fat 32 ) and not the microtrack.
Don't remember whether this had been posted.