My vote is for none.
Maybe this Zelda will use something that is not an instrument of sound to move the story along. Maybe a prism for light or some way to dig into the earth or something. I don't really have too many good ideas here.
Don't have one at all. I think there are better ways to do this. WW used wind instead of sound. I think the new Zelda game should use light instead of sound. Use the rainbow or something as the main thing, and maybe a prism to capture the light and show it in different ways to progress in...