The assignable mix outs are for you to sperate your sounds coming out the back of your MPC. Here's a quick run through. Hit mode, then hit pad 8. hit F2. You will see a bunch of ST's at the top of your screen. What that is saying is that all of your pad's are assigned to the stero outs. Now hit the pad you want an output to go to(make sure your in that progarm). Highlight the ST. Now turn the wheel. You will se a 12, and 34. leave it at 12. Now hit F1 and you see the panning at the top. Now turn your whell all the way to the left to get the pad to go output 1 or all the way to right for output2. contine for the other mixouts.