They are designed to make *very* simple EDM-ish sounds. The inbuilt chord variation is more interesting than a 'normal' style. They predate the more complex 'looper' function that came in with the SX series.
Start one of the DJ styles with any chord, then play around with style live control (filter, resonance, style parts, retrigger etc).
They work a little better on Genos which has more live control knobs to play with at once.