Spliting VBR MP3

[Petrucci]

I'm trying to make a rip of a movie that has 5 sound tracks (1 normal and 4 comentaries). I want to keep all tracks and since there are four extra tracks, dual audio avi is out of question. So i thought of making a regular avi/ac3 and then having the other 4 tracks in separated vbr mp3, i would load them in bsplayer. I now have all the tracks encoded and i want to know what is the best way to split them so they don't get out of synch(i'm thinking in 3CD).

I thought in adding the tracks one by one to the video, separate them in nandub and then extracting. Will I have problems because of tracks being vbr??? Is there a better way to do this??

All sugestions are welcome

Thanks