Once you've installed the latest drivers for your Line 6 USB device on your computer's operating system, connect audio monitors/speakers to the audio outputs of your Line 6 USB device or use the headphone output jack. You can download the latest software from our website at the Downloads page.
The built-in soundcard output of your computer will not output processed amp/effect tones from GearBox/POD Farm software. Also, connecting the audio output from your TonePort/XT device into the audio input of your default soundcard will result in you hearing latency (short echo/delay). Please connect your computer speakers to the output of the TonePort/XT device and not your original computer's soundcard output.
Please see the pic below illustrating a correct setup and connection example.