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

Published: Feb. 22, 2023, 5:30 a.m.

This question was sent by Richard, and he writes:
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\n\u201cHey Vidas,
\nI just watched your video of 4 movements your Nun Danket Suite - VERY nice.
\nQuestion: how do the tablets with the music score know when to switch as they do?
\nThanks!
\nRichard\u201d