The action of a piano is the connection between the player’s fingers and the notes that are heard.
A piano has thousands of moving parts which all have to be working together with exact precision in order for the piano to work at its full capacity. A well trained piano technician will be able to make minute adjustments to these parts to provide a uniform touch and feel across the full range of the piano.
Voicing is the combination of steps applied to provide an even tone and volume across the entire piano. This is done by manipulating the hammer felt. Often if a piano has had lots of use over the years, the hammers will be worn down. The hammer heads can be reshaped back to their original form which will produce a much more desirable sound.