SamK
Given the topic title
How to play/save youtube type video’s from Dillo, and/or save the audio track
Streamlight makes an excellent partner with Dillo as outlined in a video by dolphin_oracle and the antiX FAQ.
http://www.youtube.com/watch?v=2M5B5aXBDwk
http://download.tuxfamily.org/antix/docs-antiX-17/FAQ/streamlight.html
There is also a short overview how to use it
Main Menu→antiX→antiX Video
Incidently, it is used to show all the help videos listed there.
Because it uses very few resources it works on a very wide age range of kit.
It is able to stream in real time from Youtube to your local system playing the audio/video content or download it to save it.
A way to extract the audio or video from the download might be a one line command using sox or ffmpeg (both shipped in antiX-Full) which could easily be scripted or given a keystroke combo.
Erm, noticed that you edited that from you post while I was replying.