No audio on iPad(version 1)

I run tversity pro on windows server 2008 r2.

Tversity streams perfectly to my xbox, ps3 and pc’s and my songs even play on the iPad.

However when I go to play a movie (mainly avi’s) on the iPad the video plays but there is no sound whatsoever. I am brand new to tversity and wouldnt know where to start in debugging this, anyone have any ideas or preferably a solution :D??

Thanks,
Mark.