I am running Fluenz on a MacBook Pro using an external combination USB speaker / microphone. I have selected the external speaker / microphone as the input and output device on my Mac and I can test them through the Mac sound selector successfully. When going through the Fluenz lessons, the sounds comes out of the external speakers but when I try recording, either nothing records or nothing plays back though the external speaker. It all seems like it is functioning correctly (no error messages etc.) but there is no playback of my voice after recording.