This is version 3.00 of Music Composer, a shareware program for the
Apple IIgs by Clayburn Juniel.  Music Composer is a music sequence file
editor.  It is built around the MIDI Synth tool (Tool035).  You can edit
and play SynthLAB music files with this program, and also create sequence
files from scratch.  It accepts MIDI input and output from the keyboard
and mouse.  Packed with ShrinkIt-GS v1.1.