Ok, I did a test run and the issue seems to be solved. Great! Apparently the new BSP firmware made it. So I assume, that both the MCC version AND the BSP firmware necessarily have to be the newest to avoid issues (?).
There's one thing I've noticed (noobie?): after the whole procedure (BSP firmware update and reset) the input of notes to steps doesn't work as before, which was: hold the step, press the pad, done, note is set to that step, and the step was NOT muted. Now, when doing the same thing, the note is set to the step as before, but the step is muted and I have to unmute it. Did I miss or forget something here? The other way round also works, i.e., hold the pad and press the step, but: in that case the sound is triggered a bit longer, which I would like to avoid.
Thanks for helping out.