Hi, I have been trying to hook up a vinyl turntable to my Mac Pro via a Numark (stereo IO) phono to USB interface without success. I am a new Mac user, so perhaps I am missing something simple. Here is what Im seeing: on the audio midi setup page the device appears as - USB audio codec 0in / 2out USB audio codec 2in / 0out - I selected to use this for sound input (mic icon) In system preferences/sound - Input : is set to USB audio codec - input level moving indicating that a signal is being received from my turntable. output : Audio line out port - but there is no output (all other audio works fine when this port is selected ) To my knowledge no driver is required. Minimum system requirements for the Numark device is Mac OS 9 - I am running 10.7.5. Any help would be greatly appreciated !!