So -

Coming from Xsplit - I would have a scene set up - that when I clicked it - it played an intro video (w no sound) and the intro audio. The video would fade out to a transparency - and then you'd see the camera (w the audio still playing).

How would I mimic this in Vmix?

As I can only seem to figure out how to transition - after the video is done- and that video would have to have the audio associated with it.. so when it was transitioned - then the audio would cut out.