One tiny thing that is often overlooked when connecting other powered devices to the EZ-B is that every self powered device MUST share a common ground with the EZ-B circuit board.

Thanks to everyone for your help (Robot-Doc, vhs896, joseph4760, and Lumpy. I flipped the switch to USB and now the board does play when connected to the EZ-B. Something I should have seen much, much earlier. Unfortunately the sound volume is very low. I am able to issue commands to trigger sounds and change the volume level. But between the volume levels 25-255 nothing is audible. Volume level 0-24 can be heard, but is not useful for my needs. Could the speaker that I am using be the problem? Thanks Again!

You might want to look into getting a small 5 volt pcb amplifier to boost the output audio level. An ebay or Amazon.com search will offer you many choices.

@chrisb66, I had that same problem as well. I also thought about getting a small amplifier, but opted instead for a mini rechargeable Bomb Speaker (about $8.00) that I got off of Amazon. It works really well, and can be very loud.

@chris like robodoc suggested the output is a low level output. It would work great for headphones

Here's a 38 watt amp from sparkfun if you want to keep with the same store. https://www.sparkfun.com/products/9612. This should be enough power for any speaker you use. 38 watts is 4 ohm so at 8ohm it's 18 watt output.

There is a great community here on EZ-Robot. Thanks to everyone for your help!

And the nerd will inherit the world... LoL

@chrisb66 If you are connecting an external amp please take a look here

https://synthiam.com/Community/Questions/1189

#9