Lots of questions, Bobby.

First would be, why did you go buy an expensive mixer and then plug the Ketron into the Audigy?
Secondly, of course, is, did you make sure the volume slider was up on the Ketron?
Third, use the headphones and make sure you hear sound.
Go to the Record Input on the Creative Mixer and make sure it's set to whatever input you're using.
Next, make the sure PLAYBACK slider for the Creative, for whatever input, isn't muted, that one has got me on more than one occasion.
What OS?
Are you getting system sounds out of the Logitechs, and have you checked to make sure they're plugged in, turned on, and the S/PDIF input is connected to the output of the SoundCard.

I do not believe that this is a BIAB/RB issue. If you get sound from the SoundFont synth, and you see indications on the MIDI indicator on the Ketron, it should be producing output. So, using the headphones first verifies that the SD2 is working. Then, you need to go trace back from there to the Audigy. If the Logitechs have an analog input on them, plug the Ketron directly into them and bypass the computer audio.

Finally, it is very possible, if everything else is correct, that your Audigy drivers died. You may need to reinstall those, as well. *That* is a PITA.

Gary

I'm blessed watching God do what He does best. I've had a few rough years, and I'm still not back to where I want to be, but I'm on the way and things are looking far better now than what they were!