There are two ways to create an Activation Sound: by using a Switch, or by placing a MUSICSFX sprite in a sector with a Lo-Tag.
Switch-Activated Sounds
Place a switch somewhere in your level. Tag it [ActivationSound,Channel]
. Every time the Switch is pressed, the ActivationSound will play. If you don't want your Switch to activate any effects (like a door, etc.), just give the Channel a unique value.
MUSICSFX-Activated Sounds
Place an M[DoneSound,MovingSound]
in any sector with a Lo-Tag. When the sector's Lo-Tag function is activated, the sounds will play. Note: DoneSound and MovingSound are the most common values, some Lo-Tag functions don't use the MUSICSFX sprite to control the sound they make when they are moving or done moving.