The Arturia KeyStep Pro is a successful combination of Arturia's cult controllers KeyStep and BeatStep Pro. A velocity-sensitive keyboard with 37 keys, which also has aftertouch, is the primary means of recording melodies, basslines and drum triggers. Here you can also use the TR grid to place your beats on the spot. Four tracks can be played in parallel and output their notes and commands to a total of two MIDI ports, eight drum triggers and four CV/Gate/Velocity outputs. The control voltage outputs of the Arturia KeyStep Pro can be linked together; this makes it possible to play a lush modular system in four voices. Of course, polyphony is also output via MIDI. The analog clock/reset inputs/outputs can be used to synchronize a drum machine from the pre-MIDI era, a Teenage Pocket Operator or the sequencer of a modular system, for example. The metronome built into Arturia KeyStep Pro is output as an audio signal and can be conveniently monitored via the mixer or headphones. An arpeggiator and a random function round off the controller, which has been optimized with a focus on live and direct access.