What is piano regulation, tuning, and voicing?

The word "tuning" normally refers to all of the technical maintenance tasks required for a piano. These jobs are divided into the following three broad classifications.

Regulation

Regulation involves making minute adjustments to the action, keyboard, damper system, and pedals. These are called the piano’s mechanism. The mechanism is regulated by repositioning, aligning, or shimming parts, by adjusting their regulating screws or buttons, and/or by alternating the thickness of the various felts and leathers of the piano.

Tuning

Tuning is the correction of the pitch of each note by gently re-tightening metal pins called tuning pins around which the strings are wound, using a tool called a tuning hammer.

Voicing

Voicing involves balancing the volume, tone, and overall sound of the piano by adjusting the hardness of the hammer felts by pricking them with needles using a tool called a picker.