[ailurux]

Having not solved my initial problem of getting my large library to be initialised (as described above in this thread), I left the Tangara alone for some time.

Today, I did a firmware update (v1.3.0) and had it initialise my library again. Unfortunately, the Tangara behaves identical to what I described above. After a few minutes, the initialising process seems to be done (the DB logo disappears) and it still recognises only a tiny fraction of the artist folders, within those folders recognised, it will only recognise one or two albums, and only a few songs of an album. Sometimes, it names the tunes but give a length of 0:00 seconds. 

Hm, that's odd that only some are showing up. Are the tracks that aren't getting picked up by the database present in the file browser? If so, does playing these tracks from there work?

It sounds like some file or other issue might be causing the database indexer to fail early. To try narrow down where the issue is, you could try copy over a subset of your library at a time, or if you feel comfortable building and flashing the firmware yourself you could add some logging to the database (note: this might slow indexing down a bit) to see what files it's processing and when it stops. There's some docs on how to read the logs here: https://cooltech.zone/tangara/docs/developer/debugging/.

If the building and adding log statements to the firmware part sounds intimidating, but you'd still like the logs, I can build a debug .tra with the logging already enabled if you'd prefer.