RatMIDI

Overview

RatMIDI makes notes, not sound. Pick a genre recipe, roll the dice, and it generates drums, melody, harmony, and bass that actually fit together — the combine mode writes all the parts from one shared harmonic context, so the bass follows the chords and the melody isn't fighting either of them. Everything is seeded: lock the seed and you can tweak density, swing, and range without losing the take you liked. Audition parts right in the plugin with a built-in preview synth and drum sounds, then drag each part straight onto a DAW track as a standard MIDI file and play it with any instrument you want. Drums drag out however you work: grab the full kit in one go, or pull the kick, snare, clap, hats, and percussion as their own separate MIDI tracks. It loads as a regular instrument and drags out standard MIDI files, so it should work in any DAW; I build and test it in Ableton Live.

Features

• Generates drums, melody, harmony, and bass
• Genre recipes plus real music-theory rules: 11 scales in any key, 4 to 16 bars
• Per-genre melody and chord-stab styles across 12 genres — house offbeats, dubstep space, garage swing
• Negative Space knob leaves real gaps between phrases instead of wall-to-wall notes
• Combine mode writes all parts from one harmonic context
• Seed lock: tweak parameters without re-rolling
• Built-in preview synth, drum sounds, and piano-roll view
• Drag any part out as a standard .mid file
• Drag drums as individual tracks — kick, snare, clap, hats, perc — or the full kit
• Build-up engine: six styles plus Auto, with crescendo, stutter bursts and crash swells
• Loads as an instrument and drags out standard .mid files

New here? The install guide walks through AU / VST3 setup on Mac and Windows.