The picocalc keyboard is pretty noisy (and somewhat inaccurate). Do you have ideas for reducing the click noise, like putting a piece of cloth between the keypad and the main board?
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Earplugs? Loud music? Joking aside, not really
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Can’t tell for sure till one is in my hands but maybe custom rubber rings around each dome switch for a ‘slight improvement’. They would have to be the exact right size, thickness and softness for these switches… watch this space 
Did the rubber rings help?
o-rings like that are useful for cherry-style mechanical switches… can’t imagine they’ll do anything for the foil dome pop type switches the picocalc has, at best it’ll prevent you from actuating them at all
I think the keys are pretty quite,
Actually - i’d like to know if there is a way to implement a software click on a received key stroke?
Theoretically yes, but I would not try because it will have negative influence on the performance.