Open any producer's drive and you will find the same archaeology: a folder called kicks FINAL, another called from laptop 2019, and three thousand files whose names were typed in the ninety seconds before a session started.
Filenames are the worst possible index for audio. They record what you intended at the moment you saved, not what the file sounds like now — and they are written by the person least able to be objective about it. So Loopbox does not read them. It listens.
The filename problem
A name has to be decided once and then carries forever. Two years later snare3.wav is not a snare, it is a rim hit you nudged through a tape emulation and never renamed. The library disagrees with itself and you are the only one who can settle it.
A sample library is half tooling, half taste. Naming is where the two get confused.
What the analyser listens for
Four things, in order of how reliable they are. Onset shape tells us percussive from sustained. Spectral centroid and rolloff separate a kick from a tom and a hat from a shaker. Harmonic content gives a key when there is one. Tempo comes last, and only when there is enough material to be sure of it.