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 Modulethe 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.
think of the new vermona per4mer, that follows some similar concept.. ok, sounds completely different..
how to modifiy the SEM modules?
the minisequencer has 2×8 lines to be send to 2 of the SEM modules, as you can see on the assignment switches..
some strange things: since the SEM do only have sine wave as LFO mod you can add S/H (hint: sort of random) to the SEMs alternatively. see “S/H setting
as you can see:
SEM stands for SYNTHESIZER EXPANDER MODULE, because it was originally made as sort of “expander” for minimoogs..
in 1974 Tom Oberheim finally put 2 of them together and added the voice assign module and a keyboard: the oberheim 2voice aka TVS-1! the 4 voice was next, and the 8voice followed. some really mad ppl also made a 16voice,but thats not an offizial module ;)
one knob on the SEMs to seamlessly “morph” from LPF via notch to HPF, the “OFF” position is BPF. no other synth offers this!! why??
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.. ;)
the S/H section also has lag (smothing) and range quite similar to the roland system100 ,sh3 and sh5 models..
well, slow lfos..
|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)
when SEMs & KeyBoard removed..
|the digital Sequencer|
on the left: the analog step sequencer that came with some of the X-Voice models,
below: filtermodule (external)
click to enlarge –>
|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..|