When I looked for my recorded tracks. I found an ejs file - what is it?

Answer:

The .ejs is an 'eJamming Session File'

 In order to listen to that Session at a later date, you simply :

The Session will load the audio and MIDI files, and you should be able to hear them synchronized together when you press Play.

But in order to burn it as a CD or MP3 you will need to export the 48kHz .wav files first to mixing/editing software to mix the tracks, then to iTunes or other CD burning software to create mp3s, burn CDs or download to an iPod.