playing an Mp3 from Rev

[Andrew]

Hey, guys.  I got another question.
What is the best way to play an Mp3 from Revolution and have it be 
invisible?  In other words, so it will be "background music."

And by the way, can anyone recommend me a different audio file type 
that is not so memory-eating but that Revolution handles as well as 
Mp3s?
Also, how does one edit sounds in Revolution, like control the volume, 
etc?  Or even record and edit sounds like we used to be able to do in 
Hypercard...  is that possible with Revolution?
Thanks!  :)
Andrew