I mentioned something like this in a previous post. My ole Roland CR80 Drum machine had a humanize slideer that would pull things slightly off center of the beat so it woouldn't sound so perfect and mechanical. I wonder why modern keyboards don't have this function?
Bill you can do this on your BK9. Use clock shift in Style composer.
By moving the clock pulse time (CPT). Don't over do it. Maybe just select a range in a variation pertaining to a seventh chord, or maybe a bit more for an entire variation of a style. Not only limited to the drums, that guitar part can also take advantage of clock shift. Maybe you want the bass player to drive more, a few ticks will do that..Remember you will have to save the style.
Also the video Donny posted... You can get similar results on the BK9.. Naturally any arranger you can add reverb to the sax etc..
But you can also change the attack to allow the difference of individual sounds timed when played by a single note..
I personally like the G70 sliders to make these adjustments... and remember all settings can be saved in a user program.
If you wanted to... you could make changes live on the G70.