I have several keyboard layouts installed on my system: US layout (QWERTY), FR (AZERTY), and "bépo", which is a layout inspired by Dvorak, but for French. bépo is the layout I I'm using more.
Of course, I tried the different layouts, but that doesn’t change anything about the problem.
Regarding the change of keyboard shortcut for the subtrack "Velocity", here is the result:

- Copie d'écran_20260124_171931.png (33.31 KiB) Viewed 261 times
Ah! it seems that the layout I use (bépo) is not taken into account: when I type alt+y in "bépo", I get alt+x in qwerty!
So when I do "alt+y" in qwerty, it works (YES!).
Well... if I have to switch to qwerty to work in radium, it’s not a drama.
On the other hand, the problem remains entire for entering velocities that – regardless of the layout, even in qwerty, continue to modify the notes according to the Radium Piano layout.