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SEM

Oberheim SEM

SEM.
SEM

Released: 1974

MSRP: $695US

Synopsis:

Basic analog synth expander used to complement other period synths. Architecture Class: Conventional (subtractive).

Ebay Description:

The Oberheim SEM is a desktop, monophonic analog synthesizer, featuring dual oscillators (with sync), resonant multimode (low, band, notch, or high pass with FM) filter, dual ADS envelopes, an LFO, and CV inputs.

Physical

Form Factor Dimensions Weight Audio Input Audio Output Communication Port Control Input Control Output Switch Input Power
desktop ? ? filter mono no CV gate no no ?

Interface

Compatibility Multitimbral Memory Program Memory External Storage External Programming UI Input UI Output
- N/A no no no knobs/switches LED

Architecture

Multitimbral Polyphony Unison Architecture
no 1 no VCO1+VCO2->VCF->VCA

Output

Effects Pan Modulator Volume Modulator Headphone
no no ENV1 no

Control

Arpeggiator Arpeggiator External Sequencer Sequencer Memory Sequencer External Continuous Program Change
no N/A no N/A N/A no no

Keyboard

Key Pressure Chord Memory External Control External Sustain Key Scaling Velocity Curves
no no CV gate no no no

Source

Name Signal Class Waveform Octave Range Amplitude Modulator Harmonics Modulator Pitch Modulator Wave Assign Modulator
VCO1 analog saw pulse mix - no PWM: LFO ENV1 CV LFO ENV1 CV no
VCO2 analog saw pulse mix - no sync:VCO1 PWM: LFO ENV2 CV LFO ENV2 CV no

Filter

Name Signal Class IC Resonant Shape Frequency Modulator Resonance Modulator Shape Modulator
VCF analog discrete yes low|band|notch|high pass LFO ENV2 CV no no

Envelope

Name Level Rate Loop Polarity Trigger Level Modulator Rate Modulator
ENV1 sustain attack decay no no no no no
ENV2 sustain attack decay no no no no no

LFO

Name Waveform Delay Polarity Sync Delay Modulator Level Modulator Rate Modulator
LFO triangle? no no no no no no
Conventional Models
SEM TVS-1a TVS-1 FVS-1 EVS-1 OB-1 OB-X OB-SX
OB-Xa OB-8 Matrix-12 Xpander Matrix-6 Matrix-6R Matrix-1000