I know that, but there are only 8 soft keys on an SQ5 but 16 soft keys in the MixPad app, therefore you could, possibly, have the extra buses accessed through the app only. Also there is always an option for any key to have a second function, so by having a soft key act as a ‘shift’ key each bus select could act as stereo or dual mono. So the number of physical keys is not a limitation to a firmware implementation. I know the FPGA core is capable of running it, as Avantis works this way, admittedly all busses are stereo or dual mono pairs. Also they could implement the double tap on the screen mix fader, as per iLive, to select a mix.