MCABC 0475 is the first composition generated by MCABC (Music Composition Aided by Computer), a computer program written in PL/1. Its duration is approximately 14 minutes. Using a North Texas State University computer library program, the full score and parts were drawn by the CALCOMP plotter. The text, which discusses processes and procedures in developing MCABC 0475, as well as indeterminacy, aesthetics of computer composition, and pro gr am user information, was printed by the IBM 1403 line printer using an ALA chain which has both upper and lower case characters.

Performances of multimedia works are hampered by the difficulty of controlling large numbers of incandescent lamps rapidly and accurately. The instrument described in this document is aimed at alleviating this problem. Chapter I describes the design and operation of the voltage-controlled dimmer unit and the DC controller. Chapter II describes step-by-step procedures for building the instrument. Schematics, wiring diagrams, and illustrative photographs are included. Chapter III discusses some of the aesthetics and philosophy of multimedia composition, and then describes various scenarios which utilize the instrument. Included are the connection of peripheral control equipment, audio/Video interfacing, and the potential for constructing prepared tapes which will automatically drive the dimmers. The prototype was built at the NTSU Electronic Music Center.