The Spare Button LEDs on Wheatstone consoles can be turned on by various methods. By default, the surface itself turns a spare button’s LED on when the button is pressed. But sometimes you want the LED to display some kind of status such as when you put a different console on the air temporarily, or when some other function is in a particular mode. Here’s a description of the studio switch scenario that also explains how to use an SLIO to turn on a spare button’s LED.