Right.
The Soundfont format was developed by E-MU for Creative's Soundblaster, and to the best of my knowledge,Soundblaster cards are the only ones that were ever able to play soundfonts natively.
A lot has happened in the twenty years since sounfonts were developed.
It is not necessary to load the soundfont files into the banks in the sound card synth, as this function is readily handled by today's VST soundfont players.
That's where SFZ+ comes into the picture(mentioned in your other thread).
The soundfont player/ softsytnh/sampler works within the framework of your DAW (in this case MC6),and does not directly relate to your soundcard/interface.
The interfaces may have some additional features, but they all do the same thing.
They handle AD/DA conversions of incoming and outgoing signals.
MC6 handles the softsynths.
To directly answer your question, a resounding no and no, but it doesn't matter because these functions are handled more efficiently through MC6.
Does that make sense?