It would be good to have a Mac video, but I'm just trying to help you out now so you can get it working.
Basically you are just recording yourself playing an instrument to a usertrack template or your own chord progression, you then save the recorded audio and the SGU to RealTracks/UseraTracks/My UserTrack/
My UserTrack.WAV/AIFF/M4A (any of those formats)
My UserTrack.SGU
As show above you can save the UserTrack template to a video,
just choose any tempo,
any style,
save as video,
import it to your DAW,
and save the recorded instrument wav file along with the saved SGU of the same tempo.