OB-SX is the cheaper and lighter version of OB-X. Just like its "big brother" it was based on a modular system and was produced with two, four or six voice cards. But the cards are not interchangeable/not compatible with OB-X. Each voice card has: Two...
Combined into one housing, eight SEM modules feature sixteen voltage-controlled oscillators (eight voices per each of the two VCOs), eight controlled filters, eight controlled amplifiers with ADS generators that can be configured individually. All...
4 Voice is a semi-modular analog polyphonic synthesizer, assembled and based on the four SEM modules. Thus, the synthesizer incorporated eight voltage-controlled oscillators (VCO), two per voice, four controlled filters, four VCA and ADS envelope...
Keeping track of the success of his first synthesizer and willing to create a new product, Tom Oberheim simply combined two SEM modules with a keyboard and a basic sequencer putting them into one housing. This made it possible to get a duophonic...
In 1978, Sequential Circuits company released Prophet-5, which immediately became incredibly popular due to the ability to save all the parameters of the synthesizer in the presets. Tom Oberheim responded with OB-X. The synthesizer has a hybrid...
