The Akai AT-K11 is a keyboard splitter accessory designed to connect two MIDI controllers to a single MIDI output. It allows you to play two different instruments or virtual software synthesizers simultaneously using only one MIDI output interface. This device is helpful for musicians and producers who want to expand their MIDI setup without the need for additional MIDI interfaces. It also helps in a studio setup where multiple synthesizers or software instruments need to be played at the same time using a single MIDI input source. In summary, the Akai AT-K11 is a useful accessory for performing musicians, music producers, and studio engineers for seamless MIDI playback and control.