Chu Bun wrote:
Monsieur Delcamp's clip clearly shows him keeping the non-playing fingers on the strings. And this imposes a restriction on the movement of the playing finger. Especially in #52 b and c, it is quite different playing with the non-playing fingers on and off the strings. Even the professor's clip looks and sound awkward. I think the exercises are not really about damping, but more about decoupling the fingers from each other.
That's interesting, I hadn't watched the video, just worked from the music and although the video shows all fingers down for ex 54, the music shows p&i alternating, one damping while the other plays.
I'll try it the video way, as you say it makes finger control harder.