All the Xenyx USB mixers (apart from the UFX 1204 & 1604) have a 2 x 2 USB bus. Which means the interface is only Stereo input and Stereo output. The most multitracking you can do is recording two individual mono tracks, you can do this by panning one hard Left and the other hard Right, then setting up two mono channel for recording in your DAW, you can then assign input 1 to one track and input 2 to another. This will then enable you to record these two tracks individually without them being mixed together as a stereo channel.