BOSS DR-670 Dr. Rhythm Drum Machine 255 drum &amp; percussion sounds, and 16 bass sounds including Finger Bass, Slap Bass, Acoustic Bass, Pick Bass Velocity-sensitive pads permit very expressive rhythm pattern programming Roll and Flam buttons Foot control jack permits connection to optional footswitch for hands-free start/stop and fills Unique pad interface designed like a bass guitar neck for easy programming of rhythm/bass lines