Newtech's music card for the S-100 bus is essentially a digital-to-analog converter controlled by an output port on the computer. The analog output is fed into amplifiers to be heard. This approach to computer music synthesis is extremely flexible since hypothetically any possible sound can be created. In actual practice the performance of the music circuitry is somewhat limited by the speed of the host computer. Each card can produce up to three voices output to one channel.
Newtech's music software consists of a BASIC program which converts music into binary tables, and a machine-language interpreter to play the music with three voices and different envelopes. The piece on this record uses three cards each playing one voice.