I would recommand to use a midipatchbay in your setup.!
Since I use one (E-Magic amt8) my pc-midi setup is as rocksolid as hardware.
And ofcourse sounddiver works excellent with the amt8, also with third party sequencers!
(I use cakewalk and works flawlessly.)
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