Samson Graphite MD13 is a compact USB MIDI controller featuring 13 velocity-sensitive, backlit trigger pads arranged chromatically with aftertouch (two banks for 26 total pads). It provides six MIDI assignable parameter knobs, a programmable master encoder, transport controls and a DJ-style crossfader. An octave button extends the playable range. It supports CC and program change messages, is USB bus- or iPad-powered, and ships with a USB-to-mini USB cable and Graphite Editor software.