There is not Black and white piano touch in grid
Please add a black and white touch design on all pad, and when press a touch, run sound all synth enabled
And whenever you press a key, all three synths play a note. Which might be achieved by a new setting for mode in the Grid settings menu that layers one synth slot over another.
Certainly helpful for people who play the piano, and layering is a nice idea, even if it doubles the amount of voices required. Still, with three paraphonic grain voices with low density it might be possible to get 12 voices in total