It’s a little complicated, and it might be best not to bother with it, as it seems the drum stuff is being revamped at the moment. 😉
Open a new browser window (Window -> New Browser Window) and use the left side (called the project browser) to go look for the plug-in the preset belongs to. Example:
Composite tracks are used for the “comping” feature found in most hosts, where you record multiple takes and later select the best pieces of each. A track is usually automatically converted to a composite track if it has an audio input, and you start recording with loop mode enabled. This can be configured or disabled on the Play/Record page in the preferences.
Info in the Guide: http://www.zynewave.com/wiki/doku.php?id=guide:recording#loop-recording_and_composite_tracks
Edit: Beat me to it! 😛