Amnesia Custom Story Puzzle Ideas

[i3670]

This is a puzzle I've thought of implementing in a future CS. It's the piano thing in the Batman movies. Hitting 3 notes in a special order opens a door/rotates a bookshelf/whatever.

Ah yea. That's a good one

Spoiler below!

I made it in Digressiophobia Chapter 2, if you want any help with it the variables.

That'd be awesome.