Please note: As of 12.03.2013, official support for NonverBlaster:hover has been dropped, since the web moves on and Flash is not needed so much anymore. These Pages continue to exist here for archiving purposes.
Playing audio is simple: Just give the player a .mp3 file :)
See the souce-code of this site if you want to know how the movie was embedded.
Thanks to Heiko from Kotelett for the sound!