Music Key Incrementation

I noticed each key is represented by a number. What is the incrementation or pattern of the numbers?

Low C = 131
Low C# = 139

These numbers pop up in the parameter area when you click on a key.


It’s the hertz of a note. There is a formula - you can search up “note name to hertz.”

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Yup, here’s the source code mapping for key -> number:

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