I am in the middle of a record with a band that wants to have this stuff professionally mastered. I have never sent any of my mixes to a pro mastering facility. What should I be looking for in my mixes so the mastering engineer is able to do his job better? Should I mix at a lower level than I am used to so the ME has some headroom to work with? I usually apply some light mastering techniques to my mixes when I give a client the final copies(ie: light eq and limiting). I will avoid doing that for this band. I assume the ME needs only a 24bit copy of the mixes. Any help would be appreciated.