A Locked Elevator cannot be operated until it is unlocked with a switch or access card.
Create an elevator. Place an L[0,Channel]
in the elevator sector. Then place a switch or access switch (#130/#170) tagged [ActivationSound,Channel]
somewhere in the map. It will be used to unlock the elevator (the elevator can be toggled
between locked/unlocked with a regular switch). If you use an access
switch, place an access card (#60) somewhere. A value of 212 works
great for an access switch's ActivationSound. To change the colours of
the access switch and card, change their palettes: [0] = blue, [21] =
red, or [23] = yellow.