yeah kind of like that, i was thinking along the lines of one rotary encoder to scroll up & down scenes (or 2 buttons for up & down), one button for trigger scene, and one button on each channel to trigger what ever is selected on that scene and track. You know the button i mean? Hit MIDI or KEY mode & under each track there is a play button that appears, if you assign this you can trigger the clip on that track which you have selected. So if you use Toggle launch mode on the clips you only need one button to start and stop clips, hit it once to start, once to stop. Sorry if you know that already. however, that is just one way of working, im sure there are plenty of others as well, its all up to you at the end of the day.