>This is just not true at all. It's entirely true for the attack, because of the escapement mechanism. At the point at which the hammer makes contact with the

>This is just not true at all. It's entirely true for the attack, because of the escapement mechanism. At the point at which the hammer makes contact with the string, the hammer is mechanically disconnected from the key and moving purely through inertia. Once you've tripped the escapement, the hammer is beyond your control and pure physics takes over; the only variable is the velocity of the hammer when the escapement is tripped. The release phase is controlled by a single parameter, albeit one that can vary over time. The key is holding up the damper, which returns to the string under gravity. A continuous value representing the range of motion of the key would be sufficient to model this with absolute accuracy. Digital pianos invariably sense release velocity rather than key position, because it's much cheaper to implement and is perfectly sufficient in virtually all cases; the range of motion between partial and full damping is so limited as to provide only a very limited degree of expressive control. https://www.youtube.com/watch?v=XthnCDTnAGw https://www.youtube.com/watch?v=XthnCDTnAGw