• Specifications
• Polyphony - Monophonic
• Drum Tones - 1 VCO with Pulse waveform only and an octave divider
• Effects - Analog Delay (on later models)
• Filter - VCF Filter with Sweep Rate, 2x effect, Phase, Q (resonance), Sensitivity
• LFO - Phase (Sort-of)
• Keyboard - 25 Membrane Keys
• Memory - None
• Control - None
• Date Produced - 1980-81

• Specifications
• Polyphony - Monophonic
• Oscillators - 1 VCO
• Waveforms - Saw, Square, possibly more
• LFO - 1 LFO with sine and square waveforms
• Filter - 1 24 dB/oct lowpass with A/S envelope
• Envelope - 1 VCA with A/S envelope
• Effects - Glide (Portamento)
• Arpeg/Seq - None
• Keyboard - 44 keys
• Memory - 15 presets: Oboe, Clarinet, Bass Clarinet, Horn, Trumpet, Trombone, Reed, Fuzz Guitar, Bass Guitar, Vihuela, Panpipes, Marimba, Violin, Viola, Contra Bass
• Control - 1 foot switch
• Date Produced - 1979

• 
  Specifications
• Polyphony - 8 voices
• Sampler - 27kHz; 8-bits; 512 KB to 1 MB storage
• Multitimbral - 8 parts (8 midi channels)
• Sequencer - 8-Track
• Songs - 1
• Keyboard - 61 keys w/ velocity & aftertouch
• Filter - 24 dB/oct 4-pole lowpass with resonance
• Control - MIDI, SMPTE, RS422 Interface
• Date Produced - 1984

• 
  Specifications
• Polyphony - 8 voices (4 voice models rare)
• Sampler - 27 KHz, 8-Bit
• LFO - Vibrato
• Filter - simple VCF filter via JL Cooper retrofit kit
• Sequencer - Real-time digital sequencer added to later models from 1982 on.
• Keyboard - 49 Keys
• Memory - 128 Kbyte (about 2 seconds)
• Control - MIDI (on some models via retrofits)
• Date Produced - 1981-83

Specifications

• Polyphony - 16 voices
• Oscillators - 2 SSM Chips with multi-waveforms, Noise Source per voice
• LFO - Yes
• Filter - SSM Filter Chips: High-Pass Filter, Low-Pass Filter. Separate resonant Filter also available.
• Envelopes - Envelopes gens for VCOss, VCFss, and VCA’s
• Memory - Multi Patch Storage
• Keyboard - 61 keys
• Date Produced - 1979/80

• Polyphony - up to 4 voices on each midi channel
• Oscillators - 1 to unlimited
• LFO - 2 standard plus 1 Sample & hold and 1 VCF-LFO
• Filter - 24dB lowpass, hipass, bandpass; 12dB lowpass, hipass, bandpass, notch; WASP filter, Oberheim filter, 303 filter, etc.
• VCA - Multiple Amp and ADSR envelope modules
• Effects - Pitch Shifter, Phaser, Distortion, Spring Reverb, Frequency Shifter, Waveshaper, etc.
• Sequencer - clock sequencer, analog/trigger sequencer, quad sequential switch
• Keyboard - None (yet)
• Memory - None
• Control - MIDI, CV/Gate, Footswitch, Light Sensor, Theremin Antenna, etc.
• Date Produced - 1995 - Present

• Polyphony - Monophonic
• Oscillators - 1 DCO (adjustable from 2’ to 32’), switchable between ramp, square, enhance, and noise
• LFO - one LFO with sine, ramp, sawtooth, square, and random waveforms
• Filter - one low-pass 12dB/oct filter with resonance
• Arpeg/Seq - None
• Keyboard - 25 capacitive non-moving touch keys (or 37 standard keys on Deluxe model)
• Memory - None
• Control - EDP proprietary digital socket INPUT. MIDI retrofits and some MIDI-CV converters are able to provide control.
• Date Produced - 1980 - 1983

• Specifications
• Polyphony - 6 voices
• Oscillators - 2 VCOs. Organ sound generator with 2’, 4’, 8’ and 16’ drawbars.
• Waveforms - (saw, square, or a mix of the two).
• LFO - 1 LFO with triangle or square waves, can do FM, VCF or VCA
• Modulation - Rate, Slope, Delay and Depth controls
• Filter - 1 filter with cutoff, Q (resonance) and envelope
• Envelope - 1 ADSR generator
• Effects - Oscillator Glide (Portamento)
• Arpeg/Seq - None
• Keyboard - 49 keys
• Memory - None
• Control - Pedal control inputs for VCF, Release, Sync. and TM Interface in/out. No CV/Gate.
• Date Produced - 1982 - 1985