EVS-1

Oberheim EVS-1

Dual manual EVS-1 motivational poster (image courtesy of SynthFool)

Dual manual EVS-1 (image courtesy of SynthFool)

Released: 1977

MSRP: $8000US

Synopsis:

Eight SEM modules with a digitally scanned keyboard and program memory. Some had an additional 61 key manual. Architecture Class: Conventional (subtractive).

Ebay Description:

The Oberheim EVS-1 (Eight Voice) is a 49 key, polyphonic analog synthesizer, featuring dual oscillators (with sync), resonant multimode (low, band, notch, or high pass with FM) filter, dual ADS envelopes, an LFO, 16 presets, proprietary tape interface, and CV IO.

Physical

Form Factor	Dimensions	Weight	Audio Input	Audio Output	Communication Port	Control Input	Control Output	Switch Input	Power
49 keys	?	?	filter	mono	tape:Molex (optional Cassette Interface)	CV gate filter:pedal	CV gate	no	?

Interface

Compatibility	Multitimbral Memory	Program Memory	External Storage	External Programming	UI Input	UI Output
-	no	16	no	no	knobs/switches	LED

Architecture

Multitimbral	Polyphony	Unison	Architecture
4	8	yes	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	filter:pedal	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	+-1	no	PWM: LFO ENV1 CV	LFO ENV1 CV portamento	no
VCO2		saw pulse mix	+-1	no	sync:VCO1 PWM: LFO ENV2 CV	LFO ENV2 CV portamento	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 pedal	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

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