ArKaos is an application for live visual performance, conceived as a visual sampler for video loops that can be triggered from the computer, or through a hardware interface. The application is available in two versions: ArKaos VJ MIDI, conceived as a live video performance instrument, often used in conjunction with a MIDI keyboard

MIDI keyboard

A MIDI keyboard is typically a piano-style user interface keyboard device used for sending signals or commands over a USB or MIDI cable to other devices connected and operating on the same MIDI protocol interface...

, and ArKaos VJ DMX (a "media server software"), which can be controlled with a DMX console (DMX512 is a communication standard used for stage lighting devices).