SOPP701: How do two tablets with the music score know when to switch as they do when you turn pages?

Secrets of Organ Playing Podcast

This question was sent by Richard, and he writes:
“Hey Vidas,
I just watched your video of 4 movements your Nun Danket Suite - VERY nice.
Question: how do the tablets with the music score know when to switch as they do?
Thanks!
Richard”

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