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Beginner player - Parla Più Piano

It changes the contact between steel frame and resonance frame. Again, the key is just a convenient contact point and the key action itself is irrelevant. Probably depends a whole lot on the instrument in question whether there is a tangible effect and to what degree.
Well now you're just trolling! 😄
 
And... and you think you genuinely hear an impact, in that clip? 🙄 A little wiggly finger is making some actual impact in the space and connections between two parts that each weigh hundreds of pounds? You won't even detect the difference along the wood of the hammer assembly, let alone what that may be connected to!

In an accordion, the distance between accordion halves is the entirety of how the sound is produced. Each side weighs a handful of pounds, and is quite sensitive to vibrations, and you play by constantly manipulating that space. That space is explicitly designed not to be adjustable, in a piano. In fact, with the lid up all the way like that, there is no resonance chamber, or space within it, to be affected, only a reflector. There's resonance from between any open strings. Even if you were applying enough force (and you certainly aren't) to be making vibrations that can be felt along the body of the piano, this wouldn't result in changes to spacing between the wooden frame and the steel frame, because the two are connected quite solidly, enough that they may safely be considered a single body.
 
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