Normalising is one of the final steps in Mastering so if you are not going to master yourselve you don't do this as it's pretty hard to reverse for the studio in case the optimum volume and balance is wrong.

Fred
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76