No such videos have ever been made. Then again I don't know anyone really knows that much about it in order to share. The bit I know is very limited and I have been trying to figure it all out for over 10 years now.
I do use it a lot to create my custom song style. I don't even think there is a video you could purchase that explains anything more than just the bare basics.
I believe most folks have given up on using it and purchase a 3rd party piece of software to do their style creating.
I got together this past week with another forum member and was explaining how to the style creator and there were three TABS I told him I have no idea what those are for.
Regards
Drake