[Plugin: wordTube] Wordtube Playlist and HD Plugin – How do I make it work?

Dear folks and folkettes,

In conjunction with my wordTube plugin in playlist mode, I’m using the HD plugin.

Now, I’m trying to understand how to enable the HD addon to switch between a lo-res .FLV-version and a higher res MP4-version.

Since, I’m using a playlist, my question is:
Where and how do I enter the variables?

Here is my wordTube in action, with the HD function N/A: https://3dmusicbox.com/?page_id=8