The Oberheim OB-X is an analog polyphonic synthesizer. It was the first Oberheim synthesizer that was created with internal prewired modules and not with the bulky SEM modules. Because of this, it was more functional for live performance, and therefore more portable. It was introduced in 1979 and was discontinued in 1981. It came in four, six, and eight-voice models. The starting price for only 4 voices of polyphony was a steep US$4,595. Besides the generous polyphony, each OB-X came with a memory capable of holding 32 user-programmable presets, along with polyphonic portamento, and polyphonic sample and hold. The OB-X was in direct competition with the Sequential Circuits Prophet-5. The OB-X would be used by artists such as Nena, Rush, Queen, Prince, and Jean Michel Jarre. It spawned more Oberheim analog synthesizers, such as the OB-Xa, the OB-8, and the Matrix series of synthesizers.