Arturia KEYSTEP PRO 37-Key Sequencer/ControllerKeyStep Pro gives keyboard players incredible sequencing and performance power in a compact, versatile controller. Key Features 4 polyphonic 64 step sequencers 24 part drum sequencer 7 mode arpeggiator CV, gate, mod, drum gate outputs, MIDI 3. 5mm, analog sync in out, USB connections Looper, chord mode, pattern randomization, OLED display Intuitive controls that make even complex performances a breeze Unparalleled connectivity An all in one sequencing