8-out peak

Hello.
when you're about to mix your beat and assigns your tracks to the 8-out expansion. how do you prevent the sounds from peaking? cus the main output is set to stereo and now it becomes mono. And do you need to set the levels in the "individual" the same as in the "main mixer"? cus if you have set all the levels right in the main mixer, the levels in individual appears all at the same level.
(i dont know if i explain clear enough, but if you understand you understand

thanks!

the peaking issue can be solved pretty easy. I use to select "all channels" in the individual mode and just lower them all til' it wont peak.

but the other question is the most important. cuz when i make my beats i got my MP connected from the main outputs to my mixer. and i ajust the volyme on all the tracks in the main mixer in the mpc.
When the beat is done and i'm pleased with the mix and just want to record the tracks separate to my computer for processing, this problem comes up. i want the mix to stay the exactly the same volymewise. is that done automaticly, or do i have to change any levels in the "individual" mode on the mixer in my sampler?? hope you guys understand what i mean.