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Tuning gets most of the attention when it comes to piano maintenance — but regulation is equally important, and far less understood. Here's a straightforward explanation of what it is and why it matters.
What is Piano Regulation?
A piano's action is the mechanical system that connects your fingers to the strings. It consists of thousands of moving parts — hammers, dampers, levers, springs, felt components and wooden parts — all working together in precise coordination. When you press a key, a chain of mechanical events takes place in milliseconds that causes a hammer to strike the string at exactly the right moment and with exactly the right force.
Regulation is the process of adjusting all of these components so that the action performs consistently and correctly across the entire keyboard. Over time, felt compresses, screws loosen, wood swells and shrinks, and the precise tolerances that make a piano feel responsive and even begin to drift. Regulation corrects this.
**What Does Regulation Involve?**
A full regulation is a detailed, time-consuming process that covers:
- Key levelling — ensuring all keys sit at the same height and have consistent depth of travel
- Hammer alignment — ensuring each hammer strikes its string or strings squarely
- Let-off adjustment — the point at which the hammer releases from the action mechanism
- Checking and adjusting damper timing — ensuring notes stop cleanly when keys are released
- Spring tension adjustment — affecting the speed and sensitivity of key repetition
- Voicing — adjusting the density of hammer felt to affect tone quality
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