Monster In A Box-Halloween Prop

CRAPPY SOUND ALERT!! Finally got around to building one of these things. A monster in a box using a wiper motor and an irregular cam and cam follower system for the lid slamming action. All controlled by the very high tech nerve center of a motion detector security light. Box is constructed from fence pickets I happily picked up off the side of a residential street one evening. If anyone has a good video showing how to incorporate sound, please help me out with that one. I have old MP3 players and powered computer speakers, just dont know how to wire the thing into the motion detector. A drill powered MIB here-   • Monster In The Box Part 1