The USB3 gives you 2 possibilities. The headphone jack on the front is easiest if you want to listen to it with headphones. You can also
simultaneously take the Line Outputs on the back of the unit to a mixer, powered speakers or an amplifier to listen to your music. Both the line outputs and the headphone output are always identical in what is monitored, and both can be adjusted with the level slider on the top of the USB3. If you have speakers or headphones with connections that are 1/8" or RCA jacks, it's easy to get adapters to fit into the 1/4" professional connections of the USB3.