Beethoven did pay attention to the vibrations of his music which I suppose is another way to realize the music if you can’t hear it properly. He definitely knew what the notes were supposed to sound like as he wrote them down, composers and performers alike use a skill called audiation to know what the sound should be before the sound is produced. When the piano doesn’t match what the performer or even the audience is anticipating it makes for an unpleasant listening experience.
