Visible Music Monitor by Dr. Frank Levinson 1980. This is an
excellent music program with 4 voice polyphony and voice generation
by harmonic mixing. Scrolling display of music possible (playback
quality is better with screen off). Requires 8 bit DAC connected to
user port. If you need the instruction book, ask msmakela@nic.funet.fi
to forward your request to Tim Howe.