I have found it impossible to correctly display eighth- and quarter-note triplets in a printed lead sheet when the song has a straight (4) feel. You can change the resolution for the bar that contains the triplets so that it sounds pretty close to the correct timing, but forget about having it print properly. Also, there is no way that I know of to input or print sixteenth-note triplets. I know that BIAB isn't a notation program, but it would be great to see it get that much closer to one.