M is an interactive composing and performing system that takes notes and chords that you specify and manipulates them, under your control, to create musical compositions which unfold during live performance.

M contains many unique and useful features, including:
- A variety of sophisticated recording and note editing techniques.
- Controls for the selective re-ordering and randomization of musical material.
- A capability for automating changes in MIDI velocities, note densities, rhythms, legatostaccato articulations, and accents.
- "Snapshots" that store and recall any configuration of screen controls, and Slideshows, which are sequences of Snapshots.
- A means for synchronizing M with an external device, such as a drum machine.
- A performance system which allows you to "conduct" by dragging the mouse within the Conducting Grid, or to control the program from a MIDI keyboard, or to perform by selecting screen controls with the mouse.

Mac OS X 10.2