Reaper reference
From Phonlab
`reaper` command line tool
The `reaper` command line tool extracts F0 measurements from an audio file. It was written by David Talkin and is a successor to the `get_f0` command from the ESPS tools. Users of the Berkeley Phonetics Machine can install it with `sudo bpm-update reaper` command.
The `reaper` tool is not very heavily documented. To see the available options, run the command with no arguments:
reaper
The available options will be listed. You can also consult the source repository for more information or to inspect the code.