Some Midi functions are giving back some values for lightning LEDs or so. Others not but it would be helpful:
The 20 Submaster Play Functions: It is possible, when the Submaster is in Play state, to light up a LED (send value 127). Disabling with Submaster Stop. When the Submaster have its blue background => LED lights up at play midi channel
The TAB SYNC Function: LED on Tab Midi channel lights when the blue light in the Cue Window lights up.
Here is a pic of the testinterface with TWI interface for 3 submasters.
