Bob, Nice song!

When I listen on my system the main thing that comes through is the rhythm guitar and vocals. The bass is discernible, but quiet. The decorative guitar is audible when it plays, but it doesn't play all the time. In short, your mastered track could be the starting point for adding additional tracks to make a remix version.

If you import this song to RB, use ACW to extract the chords, tempo map it etc, then you could add other instruments and pan them for a more spatial sound. If you treat it as a collaboration with yourself, it could be a lot of fun. Just a thought. I've done this with some old recordings I made with acoustic guitar and vocals, and it's surprising how much the addition of other instruments can rejuvenate a song.

And hey, it's RB! You can start with the same basic track and make 50 totally different versions of it using a wide assortment/combination of Real Tracks. Doing it that way, it wouldn't matter that you don't have an input device setup on your current system.