01-25-11: SakaharaYou have to select it to play through the external speakers in the Apple Midi application. It will not do play through the external speakers automatically (the Apple Built-In Output is the default). Selecting it to play through the external speakers is not intuitive in my experience.
Everything looked fine, power on,..etc, except for the fact that it would only play through the internal speakers.
I had to highlight the HiFace in the menu of available output devices, then two-finger tap on the trackpad to pull up the configuration menu, and then select the external speakers from the configuration menu. I you didn't get this far (and I can understand how you might not have), then it was a configuration error and not a hardware problem.
I know you've moved on, so I'm mentioning this for future readers who may encounter the same issue.

