What happen if i never release a

We will never know as you told us nothing.

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Try it :wink:

The PC will remember that the key is pressed and act accordingly.

Somebody else did this a while ago and had problems after that (can’t exactly remember what). It is solvable, do a search for my username in combination with Leonardo or Micro and in combination with PC reboot; I will try later if I can find it back.