Hello @McLovinSnack , welcome to the community.
The USB output is taken from the Main mix. Make sure the Main Mix knob is turned up and the USB To Main Mix button is not pressed. You should see the LED meter above the Main Mix knob flash when you speak.
Some recent versions of both Windows and Mac operating systems have Microphone Privacy settings that can prevent any audio input. Check that Microphone input to your app is enabled.
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