We may be rehashing some things but..
In order for a track sweeper to play:
1) in your track rotation, you have to tell it to play a sweeper for that line in the rotation.
2) in the song, you have to set the intro, start, and end cues.
3) in the song, you have to set the specific sweeper to play, and that sweeper must be designated as a sweeper in your tracks manager.
You don't have to run any specific event or anything to make this happen, although you could.. whatever suits you.
I don't understand why support for sweepers and voice tracking, two of the most important things in radio automation, receive the least support here.
I've gotten track sweepers to work, so if you can't get it, let me know, and I'll try to help you get it figured out.
Thanks,
-Lee