multiple audio avi (more than 2 tracks)

[Vran]

I have created AVIs with 2 tracks with nandub no problem, but now I need to create one with no less than 3 audio tracks and cannot manage.
I'm using vbr mp3 audio tracks.
I've tried with avimux but the resulting audio is all out of sync and cannot find a combination of filters with graphedit that works.
Any suggestion please ?
Thanks

[Head Hunter]

Try the OGG format, it can have over 200 tracks.

[Vran]

Thanks I'm doing that.. much better than with mp3!