I purchase inexpensive mp3 player cards and small speakers from the "site-that-shallt-not-be-named". The cards have a trigger input or can be set to auto-play when powered, so it can be started when the burning tower is triggered. I use this all over my layout for different animations so i can add my own sounds / dialogs / music / sound effects. For example, used it with my Lift Bridge along with some timer-relays so there'd be the sound effects of the warning sirens going off, then the bridge lifts with motor/squealing sounds, stays up for a while, and then the siren sounds again for the downward journey.
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