The default compression setting is to keep the file as is. Nothing is changed. The RAW setting is similar with the exception that a file can be saved at different kHz settings.
The two true compression types are ADPCM and MP3. ADPCM is best used for short sound clips whereas MP3 is good for longer sound files.
Selecting ADPCM provides the following options:
Changing the Sample Rate and the ADPCM bits modifies the size of the file and it's sound quality. Change the settings and select "Test" to hear new, compressed sound. Experimenting with these settings can significantly reduce the file size of the original sound file. The bottom line describes how much smaller the new file is to the original. In this instance, the file is 25% of the original file size.
MP3 has similar compression options.
Bit Rate is similar to ADPCM Sample Rate. As a rule of thumb 128 kbps is equivalent to 44kHz.
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