Each audio frame consists of a 40 bit header and 31 7 bit samples. The header contains multiple scaling and offset parameters and the 7 bit samples are differential PCM.
Top channel is my decoding attempt, next are the 7 bit DPCM samples, a 16 bit offset, a 6 bit and a 10 bit scaling value for the DPCM data which look almost the same and what I assume to be some kind of exponent.
I'm getting close to the original sound, but it's still kinda messed up…
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