THE COMPOSERS’ PLAYPEN is a program developed by me (Barton McLean) on MAX/MSP which enables very sophisticated MIDI control of existing synthesizers, sound modules, and samplers. Originally inspired by “M” and “Jam Factory,” it builds on these seminal programs by offering many more ways and different approaches of manipulating note and chordal material. It uses a collection of single-track sequences and MIDI loops as its basic units. Once these are recorded, they are manipulated in many ways, some never before seen in programs of this nature. There is opportunity to keep everything completely live, or to save some or all of the material for future performance. Like my recently-completed SEQUENCER PLAYPEN (see Project 158 below), the COMPOSERS’ PLAYPEN is also completely MIDI-based, and as such, utilizes the MAX part of MAX/MSP exclusively.