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I think a QR code would be pretty limiting. Even just the intro from Doom II is 2KB.

Phones have 4k cameras, I’m not sure if there’s a QR code limit.

Or.

QR codes, or RFID tags embedded in objects with a reference to an online audio file.

There has been some tech making the control tangible by moving objects like pebbles around.

Or generative music from AR recognition of the placing of items in relation to each other.