Thanks for your comments and encouragements.
Yes, i think that i have to improved the mechanism.
On my range, it is easier than before but i cannot play, with ease for instance, an A above the staff! I think i have to work “harder”, but i haven’t unfortunately too much time.
I will send a video later with me slurring C to E. You’ll tell me please your review. Thanks a lot. Cheers, Francis.