Shrink:
My line in under the panning source is grayed out, but it does seem to work because I have a TV card plugged into that also.
My MIDI keyboard is now working as well! I don't know how, but after my last re-boot, the "Options" button now appears in the Creative Keyboard app, and after setting the correct MIDI input, I can now use the MIDI keyboard to play notes with it. I'm not sure what fixed it, but I'm happy!