Properly Set Up Transcoder for DJs

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Ok, I've managed to get myself sorted out with the config builder and all that and my stream & transcoder work, play songs from the playlist and can be heard elsewhere. Now my issue is how to properly set up a DJ Login so if I want to interrupt the station stream to broadcast live from say an event some place or some party I'm DJ'ing and then once the DJ disconnects the stream returns to the playlist. I'll admit, there's alot of technical stuff here that's more than what I'm used to, but while I'm learning things, I do still need a little hand holding because I don't know what I don't know, if that makes any sense? Anyway, my objective has been stated above, any assistance would be great!!