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USB interfaces (see Figure 2-4) come in two varieties: those using USB 2.0, and those using USB 3.0. Most computers have at least one USB port. USB is a great option for your audio interface. They can be inexpensive and offer a variety of input/output configurations.

Beware of used USB 1.1 interfaces. The latency (delay between the sound entering the interface and exiting your speakers) is too great to keep from being frustrating. You can find decent USB 2.0 and USB 3.0 interfaces for very little money, often starting at about $100 (USB 2.0), though they can run as much as $1,000 (USB 3.0), depending on the manufacturer and the number of tracks and other options they include.

FIGURE 2-4: A USB interface connects to your computer’s USB port.