: Play every single key and button on both the "push" and the "pull." If the note sounds different or "wheezes" in one direction, it's out of tune.
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: Ensure every key and button pops back up immediately after being pressed. : Play every single key and button on
: Open the case and sniff. A musty or mildew smell indicates moisture damage, which can lead to rusty reeds and mold—costly or impossible to fix. it's out of tune.