Random MIDI Arranger is a Windows-based stand-alone application designed to create entire MIDI compositions instantly. By combining preset MIDI clips with customizable rule sets called 'Manipulators,' this program generates unique instrument tracks with a single click. It includes a Render Engine that shapes song structure, track density, repetitions, and tempo, providing a dynamic approach to music creation. Users can export the generated compositions as MIDI files for further refinement in their preferred digital audio workstation.

The software features an analog-style step sequencer in beta, enhancing the creative process by allowing hands-on pattern development. Manipulators enable users to define up to ten rules that modify preset MIDI clips, offering control over the arrangement's behavior. Both preset clips and manipulators can be scored to influence their frequency of use during song generation. Additionally, song structure and tempo settings can be randomized automatically or set manually, giving users flexibility in the creative outcome.

Random MIDI Arranger supports batch importing of patterns from Propellerhead Rebirth files, making it easy to build extensive preset libraries by simply dragging and dropping multiple files. Each track can randomly select from chosen MIDI channels, allowing different instrument voices each time a song is generated. This tool streamlines the process of producing fresh MIDI arrangements quickly while maintaining options for personalization and control.