Doepfer

MS-404

Synthesizer

Main Details
Maker Doepfer Company
Function
  • Synthesizer (Analog Monophonic Rack-mount MIDI synthesizer)
Channels/Tracks
  • 1 × Voice (Analog Monophonic)
Form Factor 19" Rackmount
Signal Path Analog Hardware
Made In Germany
Date Produced 1994-
Power Source Switchable 110/220 IEC Power In
Notes MS-404 is a MIDI-controlled monophonic analog synthesizer. It takes account into the actual trend of analog sound synthesis combined with the immediate access to all sound parameters. The MS-404 is a serious alternative to the high-cost second hand vintage synthesizers.

The sound generating section of the MS-404 is 100% analog (VCO, Noise, VCF, VCA, ADSR, 2 LFO's). Even the envelope and the LFO's are pure analog and not simulated by software. The immediate access to all sound parameters is realised by 15 knobs and 6 switches. The external audio input enables the subsequent sound modeling of other sound sources like samplers, digital synthesizers or expanders.

On top of that the MS-404 works as a monophonic MIDI-to-CV interface to control another analog synthesizer. The MS-404 is capable of controlling VCF frequency and VCA envelope amount (accent) via MIDI.

MS-404 Features

- VCO
- - real VCO (no DCO)
- - switchable between sawtooth / off / rectangle (pulse)
- - pulsewidth of rectangle adjustable, pulsewidth modulation with LFO1
- - glide time adjustable, glide on/off via MIDI-Controller #65 (Portamento)
- - frequency modulation with LFO1, even in audio range for producing typical FM sounds
- NOISE
- - white noise as alternative sound source (switcheable instead of VCO)
- VCF
- - 24dB resonance filter (low pass), resonance/emphasis adjustable up to self oscillation
- - frequency may be controlled via any MIDI controller and/or MIDI velocity
- - frequency modulation with LFO2, even in audio range for metallic/FM sounds
- - keyboard tracking switchable off/half/full
(continued on following page)
- VCA
- - envelope amount (accent) controllable via MIDI volume (ctr.#7) and/or velocity
- - effect of accent adjustable (accent knob)
- Envelope
- - full ADSR type (Attack-Decay-Sustain-Release)
- LFO1 and LFO2
- - 3 frequency ranges from sub-LFO (some minutes oscillation period) up to audio (max. 5kHz)
- - waveform triangle
- - frequency and level adjustable
- - LFO1: to VCO frequency or VCO pulsewidth modulation switchable
- - LFO2: VCF frequency
- External Audio Input
- - level adjustable
- - alternative sound source instead of VCO or Noise
- MIDI-CV Interface (internal):
- - MIDI channel and transpose (reference note) selectable via learn button
- - retrigger on/off (new trigger if playing legato)
- - controlling of glide on/off via Controller #65
- - controlling of VCF frequency via any Controller and/or Velocity
- - controlling of VCA envelope amount via Controller #7 and/or velocity
- - two 1/4" jack sockets for CV und Gate Output (may be changed to CV/Gate Input when changing jumpers inside by authorized dealers)
- light grey 19" housing, 1 unit
- versions for mains input 220...240V AC or 110...120V AC available (please order the right type)
- User`s guide in German or English language
- Technical manual available for customers upon request (schematics, pcb components), comments only in German language available, schematics are international
- Reports in German Magazines: KEYS 12/94, KEYBOARDS 5/95, SOUND CHECK 3/95, FACHBLATT 3/95
Connections
Audio In Mono
Connector: 1/4" Phone Jack (6.35mm)
Audio Out Mono
Connector: 1/4" Phone Jack (6.35mm)
Gate
Connector: 1/4" Phone Jack (6.35mm)
CV
Connector: 1/4" Phone Jack (6.35mm)
MIDI In
Connector: DIN
MIDI Thru
Connector: DIN
IEC Power In
Controls
Parameter: MIDI Learn
Control Type: Momentary Push Switch
Parameter: Glide
Control Type: Rotary Pot
Range: 0-12
Parameter: Tune
Control Type: Rotary Pot
Parameter: Pulsewidth
Control Type: Rotary Pot
Parameter: Oscillator Waveform
Control Type: Toggle Switch
Range: Square/Saw
Parameter: Oscillator Source
Control Type: Toggle Switch
Range: VCO/Noise
Parameter: Oscillator Modulation
Control Type: Toggle Switch
Range: FM/PWM
Parameter: LFO 1 Amplitude
Control Type: Rotary Pot
Parameter: LFO 1 Speed
Control Type: Rotary Pot
Parameter: LFO 1 Frequency Range
Control Type: Toggle Switch
Range: Slow/Fast/Standard
Parameter: VCF Frequency
Control Type: Rotary Pot
Parameter: VCF Tracking
Control Type: Toggle Switch
Range: Full/Off/Half
Parameter: VCF Envelope Amplitude
Control Type: Rotary Pot
Parameter: LFO 2 Amplitude
Control Type: Rotary Pot
Parameter: LFO 2 Frequency
Control Type: Rotary Pot
Parameter: LFO 2 Frequency Range
Control Type: Toggle Switch
Range: Slow/Fast/Standard
Parameter: VCF Resonance
Control Type: Rotary Pot
Parameter: VCA Accent
Control Type: Rotary Pot
Parameter: Envelope Attack Time
Control Type: Rotary Pot
Parameter: Envelope Decay Time
Control Type: Rotary Pot
Parameter: Envelope Sustain Level
Control Type: Rotary Pot
Parameter: Envelope Release Time
Control Type: Rotary Pot

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