Piano tuning is the process of altering the tension of the strings to create the pitches of the musical scale. The standard for tuning is Equal Temperament at A440, but different pitches or temperaments may be available upon request. Here in New England, the weather can play a significant factor in the tuning of the piano. If the piano is very out of tune, or significantly away from A440, a pitch raise may be needed in addition to a fine tuning.
A fine tuning is a fine adjustment of the tuning pins, and can only be done when the piano is already reasonably close to being in tune. If a fine tuning is attempted when the piano is out of pitch, the tuning may not be very stable.
A pitch raise is a rough tuning, intended to bring the pitch of the piano close enough to be fine tuned. Changing the pitch even a few cents can put a lot of additional tension on the instrument, changing the tuning as you go along. Pitch raises are very often needed even with regular tuning due to the climate changes here in New England. I often need to pitch raise my piano before I tune it for this very reason.
Voicing is the process of needling or hardening the hammer to create a desired tone out of the instrument. Voicing can make a piano sound drastically different. Often, a very harsh sounding piano can be made into a sweet sounding instrument; or a mellow piano can be strengthened to provide a big piano sound. Voicing is best done when the piano is finely regulated. Voicing can also make unisons sound cleaner.