I am fighting to have my stream sounding in my viewer automatically - but wasn't fully successful yet.
Situation like this: i have a regular stream which plays music 24/7 in auto DJ mode (the standard stream), and a second stream which plays single songs only on request (i call it a "jukebox-stream") - both streams are rented centova-shoutcast stream on same server.
In-World a have a switchbox which sets the parcel audio to the jukebox-stream as soon as it plays a song, and it switches back to the standard stream, when the jukebox is silent (using LSL-functions llGetParcelAudioURL(), ll