list the supported audio I/O formats
The Formats variable is a set containing the names of audio formats supported by AudioTools[Read] and AudioTools[Write].
Currently, AudioTools supports only WAVE files. There are multiple sub-formats of WAVE files, with the three most common being PCM (sub-format 1), ADPCM (sub-format 2), and IEEE_FLOAT (sub-format 3).
PCM, ADPCM, and IEEE_FLOAT WAVE files can be read by AudioTools[Read].
Only PCM and IEEE_FLOAT WAVE files can be written by AudioTools[Write].
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