Basic Audio Setup To get started Djing we are going to have to use an External Audio Interface. This will allow us to have more then one channel of audio, like Side A and Side B. An external audio interface, or sound card, lets you connect microphones, instruments, and other external sounds to your computer. You don’t need an External Audio Interface, but you will be limiting your sound quality and ability to record. This video will look at the basic setup of you Audio for DJing with an External Audio Interface.