MIDI Touch controller app, similar GUI to Korg iKaossilator?
It’s only the keyboard controller side of the Korg app that interests me not the audio side.
It maps a keyboard in 2D on the screen and you can set the key and the scale.
The keyboard layout is square with the pitch rising as you move left to right and bottom to top although other parameters could be controlled via MIDI as well as pitch.
Having a larger screen than a phone would open up other possibilities including keyboard splits etc.