Random Midi Arranger

Random Midi Arranger by Gradywerks

The Random Midi Arranger is a free stand-alone Windows based program that can generate random midi songs at the click of a single button. It uses a combination of preset midi clips and sets of rules called ‘Manipulators’ to generate each instrument track. It also features a ‘Render Engine’ which determines song structure, track density, repetitions, tempo, etc. The results can then be exported to a midi file for further editing.



  • Randomly generate entire songs in about 1 second with the click of a single ‘Auto Randomize Song’ button.
  • Program uses ‘Manipulators’ to modify preset midi data using various techniques.
  • Preset file containing midi Clips and Manipulators can be edited as if it were a regular .RMA song file. Just drag-n-drop into program to open it.
  • User can create and edit Manipulators containing sets of up to 10 rules to define their behavior.
  • Preset Clips and Manipulators can be given a score, which determines how frequently they will be used.
  • Song structure and tempo can be automatically randomized or manually fixed.
  • Each track can be set to randomly choose from selected midi channels, allowing different instruments each time a song is generated.
  • Batch import patterns from the legendary Propellerhead Rebirth. Drag-n-drop multiple ‘.rbs’ files into the sequencer to quickly build huge preset files.
  • Edit notes on a piano roll or analog style, knob and slider Step Sequencer.
  • Create and save random patches and sequencer patterns for Roland Boutique JP-08 and SE-02 (.PRM files).




Price: Free

Info & Download >> Gradywerks / Random Midi Arranger

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