Has options to plug directly into the controller itself instead of trying to work out the audio channels for your audio cue. this makes mixing sounds and previewing them so much better.
AUX cables for external speakers. super convenient to have as i can plug in amps and even a subwoofer if i want to without having to go through extra steps to make sure my computer has the ability to run it.
external microphone jack. so now i can actually put in the ability to use a stage microphone which in most cases especially when trying to make announcements or speak during parts of a mashup im making, i can do so without the curse of having weird background noises from a computer mic set up.
smooth and easy to use hardware. picking this up and using it is easy enough as long as you have a basic understanding already of how things work.