Sound files don't have a maximum in any way other than bandwidth delivery. If you are delivering over the Internet it is "always" a compromise and you should size and compress all objects for the fastest possible delivery. If you make your tour 30Mb then it's just like downloading a 30Mb program you have to sit and wait until it is delivered. Tourweaver is slightly different as it dribble feeds right from the start but "rarely" does it work properly until it is (the tour) fully downloaded.

Start small and learn the program before adding too many bell and whistles.

Regards, Smooth