hey guys, i've been browsing around and really like the site. And now the reason for this post. i recently recieved a behringer ub1002 as a gift from my girlfriend, i have my yamaha psr-175 connected to my pc through usb, i use fl studio to program my kicks, and snares, my problem is How do i use the mixer in conjunction with everything else? and what exactly is the main purpose for this mixer? im relativly new to the music production so i would appreciate any help at all, thanks in advance guys.