RadioDJ has some predefined track types:
1. Music
2. Jingle
3. Sweeper
4. Voiceover
5. Commercial
6. Internet Stream
7. Other
8. Variable Duration File
For some of these types, RadioDJ will take some custom actions, so it’s not a good idea to play with them until we know what they represent.
The first type, named music must be assigned to music track that we expect to be played using rotations. To this types are applied a set of rules like checking when the artist was played, when the track was played etc.
Sweeper and Voiceover type is for tracks that will be played on top of music type files (overlay).
Internet Stream represent files that are not psychically present on our hard-drive. They must be streamed from a server (web, shoutcast, icecast, etc).
Variable Duration File type must be assigned to files which will change its duration in time, for example a news file which will be overwritten often. This allows you to import the file once and then to just overwrite the file to keep it updated.
On this type, the file will be scanned every time before playing, to get its new duration.

Tracktype Selector