How can I hear both my singing and my MIDI output?

Answer:

First of all, set up your mic to capture your vocal by a) using your computer's internal mic if you have one; b) using a standard analog mixer and connecting it to the line input of your computer; c) connecting an ASIO-compliant USB mic to your computer; or d) connecting an XLR mic to an ASIO-compliant audio interface connected by firewire or USB cable to your computer. Check Preferences>Audio to make sure your mic input and audio output are correctly set. Then check Preferences>MIDI to make sure your MIDI input and output are correctly set. Then make sure you have an Audio Track and a MIDI track added to your seat, and you should be able to hear both your singing and your MIDI output through your headphones or speakers (don't forget, you will hear both slightly delayed by eJamming's sync system).

NOTE: 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