I want to give credit to Carl Cowly with his CAR/P 300 Player boards. I bought two of these and they are great. In about 5minutes I had sound uploaded to the board. The sound quality played through powered speakers is great. The board has several options for triggering.
My props are triggered using Combo Flex ECT motion detector which, when activated, sends power to a power strip. I have an air solenoid and the CAR/P 300 connected to the power strip.
The prop and sound are activated at the same time.
Here are the links
Computer & Electronic Services
Combo Flex ECT