I ask him to start reading the playlist in order, but it starts with part 08, then part01, 02, 03, 04 ....
If it was playing previously, then it will continue from the position it left off. Even if it was in another playlist. When you add a new item, it will still check what the position for that folder was. It could be that when you have it played previously, it played the 07 file, and now it plays 08 as it's the next one in the queue.
If I had a news broadcast to play every so often, could "overlay playback" be used to play a bed over the news broadcast?
Unlikely, as it would be hard to synchronize the overlay event with the news event. The typical uses for the overlay feature are:
- play station ids when you play long DJ mixes and therefore playing ids between tracks is not really an option
- play top of the hour jingles if you don't want to interrupt the playing track
- run some important (and, typically, short) announcements, without interrupting the playing track