In creating this track I had two purposes. First, try out a new plugin called Bass Professor II from Sonic Anomaly. Second, I have been practicing a cajon pattern in 6/8, so I wanted to try it out. No amps or amp sims were used. The bass is my Douglas Beatle-style bass direct into the UR 44 interface, with Bass Professor II giving it some dirt. The guitar is my Casino, also direct into the interface, with a touch of Dragonfly reverb. The Casino sounds surprisingly good with no amp sim.
The bass playing is pretty lame. Please have mercy.
Note: Remixed to emphasize the cajon more on 4/23/19. Later that day, added the organ pad suggested by Brian.
Guitarsophist 
I dig the groove, and the Casino sounds great. Also, I would play the same bass part the same way. It occurs to me that perhaps a nice organ pad would fill this out nicely.
Brian, that was such a good suggestion that I tried it. I used a free synth called Xhip that works in Linux. It’s subtle, but it does fill the space. See what you think.