Using audio with your Vortex sites

Previously I have successfully used WP audioplayer (free plugin) which seemed to work fine.
The MediaElement.js - HTML5 Video & Audio Player looks good also (free plugin) and it also works with the WPTouch plugin so that may be worth a run.

As with most things,.. it kind of depends upon your own personal needs and tastes. That's one of the good things about Vortex in that with it being built on WP you can pick and choose whichever plugin suits you.

For site side audio which plays across every page visited I did read a very good article recently on how to set up site wide audio.
http://millionclues.com/problogging/wordpress-tips/how-to-add-site-wide-background-music-to-a-wordpress-website/