One role key dip should not play in a grand regulation is Keyframe Transfer Gauge. Dip as Articulator and dip as Mediator work effectively on behalf of piano player enjoyment. With a firm cushion of frontrail punchings and a suitable aftertouch, dip provides consistency and comfort, control and finesse. But the same dip falls short as a Keyframe...

Key dip, the Articulator, specifies a note’s depth of stroke and resulting hammer rise. Along with blow distance, letoff, and other geometry, it fine-tunes aftertouch, the follow-through needed for good and comfortable execution of each note. It also lifts the backcheck to its work and the damper to clear its strings. 

Depth of stroke (dip) as a measurement relates to neighboring keys. But the depth of stroke needed to produce a specific hammer rise and aftertouch is a distance traveled, irrespective of neighbors. So, when we use a dip block or a WNG Dip Tool to set dip, our keys need to be level for our dip to be accurate.