This is a good read about different actions and their history

https://translate.google.com/translate?hl=nl?sl=de&tl=en&u=https%3A//www.bonedo.de/artikel/einzelansicht/von-hammermechanik-bis-synthesizer-tastatur.html

Its translated from German, but still a good read.
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Yamaha Genos, Roland Jupiter 80, Ipad pro.

http://keyszone.boards.net