Action Regulation of Pianos

Your piano has seven moving parts to make one note play. Each part must move in unison to play at its optimum.

When a piano leaves the factory, each of its parts are adjusted to a tolerance of a few tenths of a millimetre. This process is called action regulation because the wood and felt parts of the action can change dimension due to humidity and wear.

The action must be checked sporadically to maintain its responsive qualities.