Seems a great idea, if possible.
If others are interested, here's what I find currently possible to 'roughly' attain something similar..
Give layer 1 for example fairly low dynamic range and high compression, so that low velocities are quite prominent, and when playing high velocities, it doesn't get too much louder.
With layer 2, raise dynamic range higher, no or low compression. That way, when playing low velo the notes are very quiet, and at high velo the notes are quite loud.
That alone gives a way to create similar 'contraposition' across each layer's velocity range. Results can be reasonably organic. But miiindbullets' idea can go beyond this.
I can certainly imagine sliders to set 'mix %' of layers per velocity range being able to transform the sound more completely and possibly opening up more notable variance - and importantly, to work more quickly..
For example, - OK, if I want the other way around to @miiindbullets' example.. so I just set a couple of sliders differently inside the layering/morphing panes, then the felt piano becomes more prominent than the YC5 as velocity increases.. could take just a few seconds to click between a number of sliders. To do it as my top example, it would rather mean zooming into more individual piano FX settings and perhaps balancing those with lots more time required to achieve not so remarkable results.
There's detail in that path, to unlock greater possibilities, for instance, add more sliders, allow any variance between layers for any velocity regions.. so for example, eliminate linearity entirely.. so playing various velocities might trigger very different balances between 2 (or more) layers.
Seems like a very 'current' kind of trick among some interesting VSTs (creating 'movement' etc.). Really like this.
Thanks mindbullets. I think posting feature requests is indeed very welcome, no need for concern. Cheers.
Pianoteq Studio Bundle (Pro plus all instruments) - Kawai MP11 digital piano - Yamaha HS8 monitors