The audiolink fallback is the auto loops when there's no audiolink data in the world.

And for the accessories in the shop, it work like beacon when there's no support, which don't make a lot of senses(not following any musics or sounds) and don't really looks good, most audiolink shaders do have fallback behavior settings or toggle(on/off) to change the behaviors

The videos:

1 It's not following music

2 It also not following the frequency setting