Bare in mind ive not worked with this program as long as other people here but you can get an overly complex system of a timer+counter that ticks down, with the audio triggering a +1 to the counter.
So "audio trigger" somewhere can do things when audio reaches a level - uh i cant explain this very well - in the audio tab of VAM you can have things that work when the audio volume reaches a level - down the bottom of the window, audio multiplier etc.
If you add Logic bricks (timer countdown etc) and have it so the first audio file triggers "disable" of the sequence or whatever, and the audio triggers a +1 to the counter, and the timer constantly -1 to the counter, and when counter=0 re-enable the sequence.
Basically, when audio is playing it keeps the counter above 0, by volume etc. As soon as no noise is produced, there is no audio trigger and the counter is allowed to finish, and reaching 0 it renables your sequence to play the next file or whatever.
There is probably a REALLY easy way to do this - but im going by what ive found out for myself and what ive read on here. Also tired so please excuse wall of text.