Arturia KeyLab mk3 is a versatile MIDI controller designed for seamless integration with both software and hardware instruments. It features a 49- or 61-note semi-weighted keybed with redesigned aftertouch, velocity-sensitive keys, and refined keybed response for expressive performance. The controller includes 12 touch- and pressure-sensitive pads, 9 faders, 9 touch-sensitive rotary encoders, a modulation wheel, and pitch wheel, providing hands-on control over DAWs, virtual instruments, and external gear. KeyLab mk3 also offers creative tools such as chord mode, scale mode, and a multi-mode arpeggiator, while the 3.5-inch full-color display provides real-time feedback and navigation. With USB-C, MIDI DIN, and pedal inputs, along with included software like Analog Lab Pro, Ableton Live Lite, and select V Collection instruments, it supports both composition and performance workflows.