Check out the bass lines from this guy...The best KB players can only come up with an acceptable bass part as they think chords 1st and bass 2nd. Now, that may be all the music they a playing calls for and if it works it works. I've played 100's of gigs with a duo using a drum machine. And, it used pedals to select multiple patterns and fills. Most people wanted to know where the drummer was. But, I was singing lead or harmony, running the drum machine, and playing bass. At the end of the gig I would be mentally exhausted.