1

When the key is depressed, it rotates around the pivot point up to its limit.

2

A velocity sensor measures key velocity and transmits the information as a MIDI message to the sound generation unit.

3

While key is pressed down, the sensor keeps sending the MIDI signal without changing the velocity value.

4

While keeping the key depressed, a change in pressure on the key sends an aftertouch MIDI signal if the keyboard allows it.

5

When the key is released, the signal stops and the spring pushes the key back to its resting position.