If you are able to place it like in my video (it is on the edge of the MoXF, supported by the back part of the keyboard stand with a supporting specially cut styrofoam block underneath), you can reach the imporant live buttons for arranger functions easily enough, and the buttons are fairly big. Changing individual sounds however is difficult, you have to prepare sounds/sound changes at home, e.g. by preparing performance lists for the USB stick.