EDIT: Totally overlooked you said online. Ignore me!
Command Line Option
I use rockpapergoat’s instructions, only I’m using yt-dlp since youtube-dl doesn’t seem to work anymore
My batch file (Windows) looks like:
@ echo off
echo.
“C:\path\yt-dlp.exe” - -extract-audio - -audio-format wav %*
(Only no spaces between the double dashes and between the @ and echo)