Why are the other players in my Session not hearing the great patch I’m triggering with my MIDI controller?

Answer:

eJamming AUDiiO comes with a good but basic Sonic Implants MIDI Soundset which is fine for most general performance situations. If you want the other players to hear the specific sound or patch you've chosen in your own non-eJamming sound module, they also have to have the same patch available on their sound generator and select that patch as their MIDI output. Or send the output from your sound generator as audio input into one of your available audio tracks on your seat, so they will hear what you're hearing. The advantage of sending MIDI data, however, is it takes less bandwidth than audio data and can require lower sync settings for the same Session.

NOTE: Because eJamming AUDiiO uses the General MIDI specification so that everyone in a Session hears the same instruments when connected over eJamming, if you are not using  eJamming's internal Sonic Implants soundset, be sure your MIDI sound generator is set to a General MIDI soundbank