Marcus Müller on Nostr: files this short don't even benefit super much from dictionary compression schemes, ...

files this short don't even benefit super much from dictionary compression schemes, so, my guess is that this is straight 4, 6 or 8 bit µ-Law PCM. I'd start by figuring out DAC sample rate (record audio, look for spectral repetitions = harmonics at multiples at the sample rate; this thing will have anything but nice reconstruction filters), use that to divide file lengths by number of samples to get bits per sample. If that happens to be darn near to an integer, yeah, no…