Assertion: piano's design | /r/CapableOf | determine the weighted keysfeeling
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Source sentences:
text: The design of the key action mechanism determines the "weighted keys" feeling; that is, the feeling of the heaviness of the touch of the keys.[need quotation to verify]"A professional pianist is likely to care most about the piano's action, because that is what controls its responsiveness and relative lightness--or heaviness--of touch.