Subtraction Engine is a Max for Live MIDI effect that transforms predictability into creative tension by selectively muting steps of incoming MIDI drums, melodies, and harmonies. Designed for dynamic variation and live performance, it enables real-time manipulation of rhythmic and melodic material through programmable probability, locking, and randomization controls. Use the Dice button for instant inspiration or engage Auto Dice to continuously evolve patterns at musical intervals. Euclidean and Count modes provide structured generative foundations, while Secure and Override modes govern how randomness interacts with locked steps. Route muted notes anywhere in your set via the included X-Relay utility to build complex inter-track interactions and capture evolving variations directly into new MIDI or Audio Clips for further arrangement.