Firstly, download and install the latest driver for your audio interface (if available).A USB interface is used for this example. Most external audio interfaces use either USB, Thunderbolt or Firewire to connect to your computer.
Audio interfaces generally improve the sound quality, allow you to achieve less latency and give you more options such as multiple inputs and outputs as well as record monitoring capabilities. An audio interface allows you to connect microphones, instruments and other sources to your computer, so that you can record them into Live.