Hi Jerry,
Did you import the INS using Setup/MIDI Device Configuration/Device/Import device description (or alternatively, Setup/Quick MIDI Device Configuration/Import sound names)?
If so, did you then select the new device (Casio) as the default playback device? That should replace the GM instrument patch names with the "special" Casio names for a given bank. Keep in mind that the Casio may have a set of GM MIDI instruments for the default bank, so you'll want to check all the available banks for the device to see all the extra instruments.
It may also be necessary to turn off the GS Wavetable to get the sound to work properly and avoid any latency issues. If you need to do that, you can go to Setup/MIDI Device Configuration/Port/Select Ports and UNCHECK it from the right-hand panel.
Hopefully something above helps
ttfn,
Sherry