The following links provide users with detailed information about the types of audio files and compression compatible with Fuse.
For details about the MP3 format: https://en.wikipedia.org/wiki/MP3
For details about the WAV format: https://en.wikipedia.org/wiki/WAV
More info on audio terminology: http://www.stirlingaudioservices.com/gloss.htm
More info about mu-law or (µ-law): https://en.wikipedia.org/wiki/%CE%9C-law_algorithm
Plum recommends using the free Audacity application to record audio. Audacity is free and easy to use, but it also has in-depth tools and plugins for more advanced audio manipulation.
Follow this link and select the proper operating system download Audacity: http://www.audacityteam.org/download/
When deciding on the audio format for an application, keep in mind that the Fuse engine automatically runs the files through a compression µ-law algorithm. This downsamples all files to 8-bit, 8kHz.
There are three audio formats for development that are always recommended:
8 kHz, 16-bit, linear PCM WAV
8 kHz, 8-bit, µ-law WAV
32 kbps, 16khz, MP3 (Note: Anything larger is unnecessary. Poorly recorded MP3 files might not work with Fuse.)