I'm trying to convert the audio files from an old protools version where the files were headerless and lacked any other indicator of format.

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In this case, the answer is sample rate: 44100, 24 bits per sample, signed integer, Big Endian.

The converter I'm using, "sox", is available on Mac via homebrew, and the commandline I used is:

sox -r 44100 -e signed -b 24 -B -t raw "Guitar --01 L" Guitar-01-L.wav

Some of these parameters might be different, depending on what choices you made for the project, but I'm pretty sure these were the default on Mac OS 9 on a PowerPC mac at the time.

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