A frequently tuned piano will stay in tune longer. Over time, if a piano is not tuned, the repeated humidity and temperature cycles will cause the pitch to drop and stay there. In this case, often two or more tuning passes through the instrument are needed to bring it back to standard pitch. This is called a ‘pitch raise’. These multiple passes can be done as part of a single visit, but the tuner will sometimes charge extra because of the additional time involved.
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