An mtpl playlist works like an m3u playlist, but supports folders, playlist in playlist and sub-tracks (via the familiar '|' operator of m-TAGS locators). Sub-tracks may be separated by ',' (list) and/or '-' (range).

Playlists can be created manually or via Utilities/Save as playlist....

BEWARE OF RACE CONDITIONS!!! They will happen if a playlist directly or indirectly references itself

Email luigi@m-tags.org for anything