A piano also periodically requires a service called voicing. Because the tone changes as the felt hammers wear, periodic voicing of the hammers is necessary so that your piano will have an even, full tone throughout the entire scale, and produce the widest possible dynamic range.
Every piano has its own distinct sound or "voice". In many ways, that's how it was built and that is its personality. But over time, the more a piano is played, the more the hammer felt that strikes the strings wears down and compacts. This hardening can cause the tone to become too harsh or bright, and it's difficult to produce a wide or even range of expression, no matter how much you try to play using dynamics. In other situations, the piano may seem too dull or lifeless for your taste.
<