I recall that from my youth. When I press on any of the controls on a piano, I want only the sound I anticipate getting, and no more. If complete silence is a 1, and a mosquito buzzing in your ear in a dark bedroom is a 10, then a persistent, predictable *squeak!* or *thop!* coming out of a piano’s damper pedal is probably around a 9 or so. If the piece is legato, it’s more like a 16.
And of course, everything I play has “cantabile” written in it at least once. *sigh*