Oh, I'm not sure what you mean by "audio driver" in this context. I have an MIDI input driver, which I've tried the two options—Keystation 88 and MIDIN2 (Keystation 88)—but not the <No MIDI/Sound Input> option 'cause...I can't figure out how that could possibly work.

I have a MIDI Output Driver, which lists the KeyStation 88, but since it's not a synthesizer, that would seem to make no sense. I may have tried it, but mostly I've stuck with Microsoft GS Wavetable Synth.

For Synthesizer / Sound Card, I've been using General MIDI Instrument Misc. I have a Sound Blaster Z but that's not one of the options and I figure the default should work.