Ditto, I'm stuck at work too.
As for your questions about MIDI, I almost never use it but it does work. My second card is an old SoundBlaster 16 ISA fitted with a Roland Sound Canvas daughter card. I can put MIDI playback through that, or I can use an external serial MIDI interface plugged into
a Yamaha PSR 510 keyboard. I can switch which MIDI device to use from within Cakewalk. The Gadget Labs card has no MIDI capability of its own.
As for monitoring, I have a Alesis mixer. The Gadget Labs card is fed by 4 submaster outputs + 4 channel direct outs, and feeds back into the tape returns of the first 8 channels. The Sound Blaster card and Keyboard feed into different channel inputs. The control room output feeds a stereo receiver and Yamaha monitors (I should use a real power amp, but this is a stop-gap) while the monitor out feeds a Peavy power amp & big PA monitors for live in-studio jamming.
I assume your monitors are being powered by some sort of amp, fed by the Ardvark?
A yellow flag in Device Manager indicates a problem, if you click on the device there will be a description. Typically it means the device driver is not loaded, or the device itself was disabled by Windows because it was in coinflict with another device.
"Available device" is Windows way of saying "first thing I find gets the playback". This could be part of your problem, any playback device SHOULD be listed there.
Any 24 bit playback (actually any Cakewalk audio playback period) is always pushed through the Gadget Labs card. The Sound Blaster is just for playing the occasional game, plus being the parasitic host for the Sound Canvas card.
Let me know what you find after you dig through the machine...
RW