I use this together with Midi-Ox.
Why? I understood that Midi-Ox can divert the channels to different ports, in order to do the following:

Channels a to b directed to out port 1
Channels c to d directed to out port 2, etc......

So I can apply Studio with Mozart (which sends out all 16 channels on one port).

I also downloaded Maple Midi tools, but can't find how to redirect the channels to different ports as layed out above. In Midi-Ox I can (but to gaive Mr. Hruchalla the credits, I want to use his software).