@nprofile1q... @nprofile1q... @nprofile1q... @nprofile1q... Yes but here the question is: do you need compressed air to run through the system to be able to use the physical part of the keyboard at all ? And if yes, what electronic component can you use to detect the pneumatic key presses. But I guess the answer would be to go later in the information flow, after the keyboard itself and more on the matrices side. Wait of my league. But we just need one really motivated person with too much time to figure this out, as said by Dan.