Cubase doesn’t do video editing, that said, you should have been able to mixdown your audio. So you must have done something wrong at mixdown. If you could play the music in your project then you can mix it down - that’s the rules.
Thanks for the help everyone but its working ok now.
I think I was having issues with my E-MU 1212m driver. All I did was restart my computer today and everythings GOOD! E-MU drivers can be kinda funky sometimes