The Proteus 1 was released in 1989 as the first synthesizer module that E-mu Systems had ever produced. It contains 32 voices of multi-timbral samples, coupled to a basic synthesizer sound architecture. The sounds for the Proteus came directly from the EIII library. The Proteus 1 Reason Refill includes pianos, organs, strings, horns, guitars, basses and drums. The sound is laid back, yet very effective in the popular music mix. When introduced, the demand for Proteus was so great, E-mu Systems could not produce enough of these modules. The Proteus was a massive hit that started the revolution of sound playback modules.