If u have a keyboard or sound module u wanna use in ur beats, u use the mixer 2 connect them, but u also need a soundcard.
U can also go for an Audio Interface if u don't need a mixer. They come in PCI, USB & Firewire, so u can take them wit u, basicly the same thing as a Mixer, but without all those knobs and sliders, and u control the interface from software, perfect for a PC producer.
Not really, a mixer outputs a stereo signal, an interface will record the tracks seperately.
Alright, thanks for the response. I dont think I'd need a mixer as I've ordered my Fast Track Pro USB Interface. Maybe when I get that turntable later in the year