Posted LWX music uses a tone burst to mark the start or end of each
improvisation.

The tones are DTMF "digits" at -20dBFS. Each burst lasts one second
and consists of either one or ten tones. Each digit has an on/off
cycle of 65%/35% of its duration.

Start of track
yyyymmddtt, e.g. 2025010103 is recorded on Jan 1, 2025 and is the
third take of that session.

End of collection
* is the single "digit" marker used to mark the end of a collection.

Start of collection
#yyyy#sss#, e.g. #2025#001# is the first collection released during
the year 2025. (This burst is always omitted for the collection of
all tracks from a single recording session.)