Yes, you can save two transition presets, but you'd need two MIDI keys: one to trigger your scratch transition, and one to trigger the Random transition. Actually.... there is a way that I think you could make it happen with just one MIDI button, but you would have to assign the MIDI button to the transition list (which should toggle it between the first and the last entry in the list), and then you would have to set your scratch transition at one end of the list, and the Random transition at the other end. You can re-order the transitions by dragging and dropping them in the Plug-ins panel of MixEmergency's Preferences