Have been playing around with this application, I have an immediate need for a song I'm working on. I used Acou6tic guitar but I'm not happy with the results.
I found that not only can you modify the 102 patterns that are already set up, but you can store them in the patterns section and call them up in Sonar. Not only change patterns, but tempo (multiples of Sonar's tempo), change the pattern so it fits 3/4, 4/4, etc.
Walt