There are three types of buttons - small (pitch bend, cues), big (main transport) and mid (the rest). Mid-sized buttons have 2 leds - red and blue, therefore 3 colours avilable - red, blue and purple (red+blue). To lit up a led just send a midi note back to the vms4 - the same note vms4 sends out when you press a button alone (red) and with shift (blue). Small and big buttons have 1 led.
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