To be honest, I found this confusing as well when I first tried it, and even still I'm not sure if I'm getting it properly. Let me see if I can clarify by breaking it down into a few extra steps - and perhaps someone who really knows what they're talking about can correct my errors.
Create 10 audio tracks
On each track, edit in sounds with the ...
thing is, it was hard to figure out how to do this when I had it in my head and make it work without a loop-back, so I'm sorry that you didn't understand at first. Believe me it puzzled me at first as well :) I'm glad @JohnSoundSnow was able to help you out