There is a 2 bar section in Brahm's Second piano concerto (4th movement) in which the right hand must play a D major scale in thirds at a tempo that is about 104-108 per quarter note, with the scale being septuplet 16 notes... ie., the equivalent of 16th notes being played at about 184 per quarter note.I am debating how to try to get this even close. Emanuel Ax seems to be able to do this with ease. Others are less clean. Anyone here venture into these waters and have something to share? Since this is so rapid, I am thinking that the first three thirds would be 1-3 2-4 3-5, then a very quick move to the G and B with 1-2, the finish the scale with 1-3 2-4 3-5... repeat for for the full 4 octaves. The standard fingering for D major thirds seems very cumbersome for the rapid pace this has to happen. Shoot, 184 is not easy to play SINGLE note scales cleanly, let alone double thirds.
Pollini? Looks and sounds like the left hand as written by Brahms is left out and he plays the D major scale in thirds with two hands.
I estimate a light action will have a 'push back' of about 8 ounces and a heavy action might 'push back' 12 ounces. I have a digital piano that I practice on in my office that has an action that is a tad heavy. A 12 ounce weight easily depresses a white key from the 'fat part' of the key.I am having a hard time grasping the idea that a 12 ounce force that I just overcame with probably at least 2 to 3 pounds of downward pressure (playing pianissimo) is going to do anything to propel me to the next spot. Perhaps you are meaning the natural rebound off the key bed and not the force of the weight of the key? I am one of those 'arm weight' guys. My teacher in college was a student of Lee Luvisi and that probably tells you that relaxation and economy of motion are the name of the game for me.