I have been playing and accompany singers voice with one man band (arranger) for a while. If I wanted full band effect, I use the built in drums style from the arranger. I also use my left hand for manual bass, and right hand for chords and transitions with very little melodies. It works quite good and feels like a full live band. If you use the automatic rhythm, you will not get a LIVE feeling unless the rhythm really fits well with the song. With the manual bass and your own chords, you can accentuate better. This method really works for me and I know some of the great players in this forum (if not all) uses the same methods.