I find very difficult to play the lowest and fastest parts of the left hand "ppp"... in "scarbo"
Get some recordings by great pianists.Then you will hear how the things on paper are meant, instead of theoretizing around.Best Wishes,Monk
Of course, there's always Perlemuter's recordings as well- which are hard (impossible) to beat? Although apparently he was quite old when he made them and had lost some of his technical prowess... who could tell though...Does anybody know if Perlemuter made any recordings when he was in his prime? of specifically ravel's works?
To generate the p touches in Ravel you have to have good finger PUSHING ability at the keyboard as well as accuracte pedalling to control the phrasing. Fingers must push the keys down instead of striking the key. That means you push down onto the notes that your fingers are already touching. This maintains very close contact with the fingers/keys and then sets up the feel for the p touch.