optional MIDIControllerProto master_speed = 34;
optional int32 master_speed_bank = 35;
+ optional MIDIControllerProto master_speed_light = 42; // NOTE: Controller, not light.
+ optional int32 master_speed_light_min = 43;
+ optional int32 master_speed_light_max = 44 [default=127]; // Inclusive.
// Buttons.
optional MIDIButtonProto preview = 18;