Beautiful early 80s Yamaha CS-40M Two-Voice Analog Synthesizer freshly serviced at synths when with warrantee- $3999!

Overview: The Yamaha CS-40M is a powerful analog synthesizer released in 1979. It features duophonic capabilities, making it possible to play two notes simultaneously, which is particularly useful for creating rich, layered sounds. The CS-40M is part of Yamaha’s CS series, known for their robust build quality and rich, warm analog tones.

Key Features:

  • Polyphony:
    • Duophonic: Allows two notes to be played simultaneously, enabling complex sound layering and richer textures.
  • Oscillators:
    • Dual VCOs (Voltage-Controlled Oscillators): Each voice has two VCOs with selectable waveforms including sawtooth, square, and pulse.
    • Oscillator Sync: Provides the ability to synchronize the oscillators for more complex harmonic content.
  • Filter:
    • 24dB/octave Low-Pass Filter: Classic analog filter with adjustable cutoff and resonance, known for its smooth and musical sound.
    • High-Pass Filter: Additional high-pass filter for further sound shaping.
  • Envelopes and LFOs:
    • Envelope Generators: Dual ADSR (Attack, Decay, Sustain, Release) envelopes for detailed control over amplitude and filter modulation.
    • LFO (Low-Frequency Oscillator): Two LFOs with multiple waveforms for modulating pitch, filter, and amplitude.
  • Performance Controls:
    • Keyboard: 44-key, full-size keyboard.
    • Portamento: Glide control for smooth transitions between notes.
    • External Control: CV/Gate inputs and outputs for integrating with other analog synthesizers and sequencers.
  • Modulation:
    • Extensive Modulation Options: Modulation matrix allows for complex routing of modulation sources to various parameters, enabling highly dynamic and evolving sounds.
  • Connectivity:
    • Audio Outputs: Standard 1/4″ outputs for connecting to amplifiers, mixers, or recording equipment.
    • External Inputs: Allows external audio signals to be processed through the filters and modulation sections.

Sound Characteristics:

  • Warm and Rich Analog Tone: Known for its classic analog warmth and richness, making it ideal for basses, leads, and evolving pads.
  • Expressive Modulation: Extensive modulation capabilities allow for creating dynamic and complex sounds.
  • Flexible Sound Shaping: Dual filters and multiple envelopes provide a wide range of tonal possibilities.


  • Genres: Suitable for electronic music, ambient, experimental, rock, and any genre that benefits from rich analog textures.
  • Usage: Ideal for live performances, studio recordings, and sound design due to its robust sound and versatile features.

Country of Manufacture:

  • Japan: The Yamaha CS-40M was designed and manufactured in Japan, known for its high-quality build and reliable performance.

Notable Features:

  • Robust Construction: Built to withstand the rigors of live performance and frequent use.
  • User-Friendly Interface: Simple and intuitive controls make it accessible for both beginners and experienced synthesists.
  • Versatile Sound Engine: Capable of producing a wide range of sounds from deep basses and leads to lush pads and complex soundscapes.

Notable Users:

  • Richard Barbieri (Japan/Porcupine Tree): Known for his innovative use of synthesizers, Barbieri has utilized the CS-40M in his work.
  • Vangelis (Electronic/Ambient): The legendary composer and electronic music pioneer has used various Yamaha CS series synthesizers, including the CS-40M, for their rich and expressive tones.
  • Depeche Mode (Synth-Pop): The influential synth-pop band has incorporated the Yamaha CS-40M into their music for its distinctive analog sound.

The Yamaha CS-40M is a versatile and powerful analog synthesizer known for its rich, warm sound and extensive modulation capabilities. With its dual VCOs, duophonic capability, and robust build, the CS-40M is a valuable tool for musicians and producers looking to create complex and evolving analog textures. Whether used in live performances, studio recordings, or sound design, the CS-40M delivers exceptional analog tones and creative potential.

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