I want to know how you sycronise a pice of music so that when the music goes quiet i can do something with my movie i.e. but a blank screen up and then when the music starts up again resume my movie.

when i have doen this with a 30 sec movies it sometimes becomes out of sync, but because it is only a small movies it is ok, with this one it is 2 mins and timing is all important.

Has anybody got any help on this please or does any body know any good help / tutorials out there?

Thanks John