The ART USBMIX4 Microphone, Instrument, and Line Mixer/Computer Interface is a compact versatile audio interface for your computer that converts analog signals from a variety of audio sources to a digital signal that your computer recognizes. It can also be used as a stand-alone mixer through the main mix outputs. The USBMIX4 provides a great starting point for personal home studio recording or for anyone wants to do mobile location recording.