I don't know about Protools, but you can do this with soundiver. (it is pretty expensive though)
http://www.emagic.de/english/products/software/sounddiver.html
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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