Regulating Your Steinway Piano
The modern piano has more than 9,000 moving parts that need to be adjusted regularly and replaced occasionally. A piano will play noticeably better with regulation every 7–10 years with typical home use.
Signs that your piano may need regulation or rebuilding include:
The action feels heavy
Playing softly has become difficult
The touch and/or tone seems inconsistent
The sound is muffled or harsh
Regulation consists of adjusting each note at over three dozen separate points. This includes shaping hammers for optimal voicing, carefully positioning hammers to strings, adjusting key weight, and cleaning, lubricating and repairing many different parts of the instrument.
For more information on regulation, open this Piano Technicians Guild webpage, scroll down, then click on "What about regulation?".