I'm glad you like it, not sure if you know this yet, but you can also speed up, slow down or change key of anything you record off a MP3 player. As far as jam tracks, you can choose just 50's or 60's or ........ on up the line.
I recorded a song using my acoustic I wrote 30+ years ago. I'm amazed how many and how freely lead ideas for it come to me as I play along with my electric.