OBERHEIM SEM / early Synthesizer Series
two voice four voice eight voice - 1974
SEM synthesizer expander module
Digital Sequencer + Filter Module
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Oberheim SEM Module
the oberheim 4voice also was available from 1 to 8 voices. since 1974 oberheim did these polyphonic synth monster which had a cool filter feature: sweeping from lpf filter to hpf and notch.
2 VCOs and very smooth sound that oberheim stands for.
some audio - a bit sick,but you may have an idea of the sound: SEM_oberheim.mp3
the programmer and voice assign module was for rotating and re-assigning the SEM modules for polyphonic play. you CAN set them to slightly different sounds, but also completely different.. the early 4voice models did not offer the programmer,the shown model is an early model and has 2 sequencers. well. imo thats the better choice because you have s/h ,noise and 2 sequencers in one synth ;)
I have seen even mod'ed modular SEM and X-voice e.g. on midiwall.com
think of the new vermona per4mer, that follows some similar concept.. ok, sounds completely different..
how to modifiy the SEM modules?
SEM stands for SYNTHESIZER EXPANDER MODULE, because it was originally made as sort of "expander" for minimoogs..
the sequencer is working in the EXT position. it can mod the pw,filters or pitch and also trigger the envs. it also adds noise (white), thats something mostly not mentioned.. ;)
|Oberheim 4-voice (OB4) (1976)
OBERHEIM four voice (OB-4) click image to enlarge..
ob programmer & voice assign
TVS1 , the official model name of the 1974/75 Oberheim 2 voice or OB2 / ob-2 (obie two)
the OBERHEIM SEM board
when SEMs & KeyBoard removed..
the mini sequencer of the oberheim - 2 independent SEQ lines and S/H sources to be send to the SEMs in 2 CV "streams"..
the minisequencer board looks like this:
another close look to the emptiness before closing it again..
|the digital Sequencer
on the left: the analog step sequencer that came with some of the X-Voice models,
|SEM vs. SEM
|there are 2 SEM alternatives: the SEMtex by anyware and the semblance by analogue solutions.. the SEMtex has a lot more (2 suboscs, mor modulation, ringmod etc.. while the semblance has midi and is quite close to the SEM.. they both sound good..)
here's the SEMtex OSC + filter section.. it's all modular..
|Oberheim||Oberheim Synth overview..|