Ok im about to buy a audio interface that seems to be the best deal for me right now the http://pro-audio.musiciansfriend.com/product/Digidesign-Mbox-2-Mini-?sku=700498 at musiciansfriend. The main reason im buying it is for recording vocals. I just recently got into the MIDI seen though im big on this sequencing stuff now. Thus far I have just pluged my WK-8000 Keyboard into my PC via USB MIDI out and tested around in Proteus VX. My question is what is the point of using MIDI in a audio interface rather than just plugging my keyboaord directly in USB would I need audio interface MIDI ?