Thanks for this topic, it helps a lot!
I am working on Glière impromptu and I have another technical question about this piece, maybe it is a silly question but for the final (6 mesures before the end) how do you replace your fingers for the notes which are reapeted (G A C F and D E A C) to avoid noise and have a regularly sound?
Do you replace first the 4th and then the other fingers, or both 4th and 3rd and then 2nd and thumb? Do you change hand between each chord?