Bruce - When it gets the valid command to play the sound clip, it plays. There is a status LED on the player that flashes when it gets the comand. It does not do that. I can take this player off the 877 board and can put it on the 628 board running the same code and it works fine. The only difference is that I am using A.3 and A.4 on the 877 for communication and B.6 and B.7 on the 628 board. Everything else is the same. That is what is so frustrating - it's like rotating your tires and now your car won't start. Rotate them back and everything works fine! Makes no sense!

Thanks again for all your help!