Core Audio Driver not working I have been using Virtual DJ on my machine.  The setup is where I want audio to play over the headphones and use a USB sound card to play audio into my headphones so I can listen to music before I play it for everybody.



However, the last time I tried, I got an error message saying "Error in the sound driver of Core Audio.  Your sound card is probably not connected, or the settings are incorrect".



If I use the headphone by themselves, the USB sound card by itself, or my speakers by themselves, they all work individually.

How do I go about figuring out what's wrong here?
When the USB sound card is plugged to the Mac, do you see it in System Profiler (from Apple Menu -> About this Mac -> More Info... -> System Report) as a USB device ?

If so, can you then see the audio device in System Preferences -> Sound -> Output ?
If not, would other USB devices work on the same USB port ?