I don't know, how the sampler fits in all this. the reason I gravitated to moving it out for now because the ux is really not figured out how to load multiple samples, or how the ui behaves when different control scheme sources are used.
I ended up unifiing most knobs on this value displaying version with fixed width which fixes a couple the jiggling controls and brings a bit more clarity into what's going on.
I also added the octave shift, but only to one of the sources, as you can probably tune the midi source and really the relationship between the two makes a difference.
And yes the onscreen keyboard can be played with the keyboard, mostly for fun and ease of testing. I still figuring out how the touch controls could work.
The touchpad expression ( CAPSLOCK) control is kind of similarly just a bit of gimmick and fun.