The MX4USB is a four-channel desktop mixer with a USB digital audio interface built in. It has a two channels, five stage, multicolor LED meter for visual monitoring the main output level, and a stereo, 1/4″ headphone output has its own level control.The MX4USB compact mixer is perfect for using in basic computer-recording setups, video editing and production studios, and portable podcasting setups because it outputs not only line-level analog audio, but also stereo 16-bit, 44.1 kHz digital audio over USB for low-noise, easy computer connection. You can also monitor back from your computer through the same USB connection.