Music on Hold: Application in online documentation not there

The online documentation
http://www.freepbx.org/support/documentation/module-documentation/music-on-hold/add-streaming-catagory states

“This example uses a scirpt created in /usr/sbin/ called “ast-playlinein” and it is used to control the parameters of “arecord” which is the program doing the heavy lifting here. Pointing at the script was all that was needed”

I can’t find the script ast-playlinein

That is an example of using it. Google for ast-playlinein and see what you find. Google is your friend.