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Help me find out what is wrong with these four keys on the upright piano?
1) I checked all the three pedals (left, center, right) are functioning correctly.
2) I checked the hammers and the actions set are functioning smoothly
3) I lift the damper and try to strummed (swipe) the problematic piano strings like guitar and they will produce that rattling sound as well.
*** My piano music improvisation/rearrangement 我的編曲演奏 (列表):
*** My instant piano music composition (List) 我的即時作曲 (列表):
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