(Summing) and how do you even know?

I got music and will be trying to use summing in the next few days for the first time with my D-box that I just bought. My music is in my signature if you want to hear it. I'm hoping that my music will benefit from audio summing as if it doesn't than why did I even buy it? I would love to get that vintage 70's 60's sound going around my voice and etc. Could anybody please help to fill me in on all I need to know for audio summing? I will be getting my cables today in the mail from a company called PRO AUDIO LA and I'm stoked.

(Summing) and how do you even know?