The Opus 3 is an analog 49-key[2] synthesizer, and designed by Herbert A. Deutsch from Hofstra University.
He also wrote the manual for the synthesizer.
The sounds are in three categories, strings, brass and organ sounds, all having their own filter apart from the organ section.
The Opus 3 features stereo outputs and can be programmed to use the panning effect.
[3] The Opus 3 is mainly known for its electronic organ sounds; it also produces strings and brass sounds.