Each time I think to that, then here it is:
how about if it was possible to access to the matrix mod simply by pressing the B knob (or maybe long press, regardless for the menu location)?
And other suggestion: in multi-mode session, that will be fine if I could to use synthesis settings of each different slot just by scrolling on the slot list, without having to press the A Knob, and then long-press to return to the slot list.
I think the interface is brilliant enough, transparent and intuitive, one of the highlight of the Parva, but for my personnal use this two suggestions whould make it even better.
There, I said it.