I'm really having a hard time trying to make any sense of your question.
If this is the gist of your question
My follow is way more items strewn through the tag system, that changes.
It is very unlikly that I am just going to follow Just One of these combined items. Each time a new combined item is created, it is not in my follow list, which is now only following this "audio" mess , and I still have the other interests I would want to follow.
then make use of wildcards. The favourites & ignore system can handle wildcards, so add audio* & video* as part of your favourite tags.
So whatever combinations of a audio-blargh maybe used, it'll be listed. Something which you'll miss out if you're going to insist on audio encoding style of tags.