A soft chord that changes semi-randomly. Connecting D3-D8 to 5V causes each note to gliss by an interval: D8 -> two octave gliss, D7 -> one octave, D6 -> maj 3rd, D5 -> maj 2nd, D4 -> min 2nd, D3 -> quarter tone. However, the direction of the interval is essentially random: each note independently either glisses up, down, or not at all.