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Compresses high-input signals while boosting low-input signals to give you smooth sustain without degrading the quality of the original sound. Onboard EQ delivers precision tone control and a special internal design insures outstanding low-noise performance.

Boss Guitar Effects Guide Book vol.9 (1993):

The CS-3 compresses high input signals while boosting low input signals, giving you smooth sustain without degrading the quality of the original sound. A range of effects from gentle compression to “squeezed” sounds is at your command. Designed for outstanding low-noise performance, the CS-3 also provides EQ for precise sonic control.

BOSS CS-3 Compression Sustainer

Using the CS-3

  • For a mellow sound: This setting is ideal for solos in ballads or mellow songs. Add a chorus effect for even more depth. (Fig 1: Level 5, Tone 2, Attack 6, Sustain 6)
  • For chord work: This setting balances the volume of each string for smooth chord accompaniment. (Fig 2: Level 5, Tone 6, Attack 2, Sustain 4)
  • For thick, rich sounds: Add Chorus and Delay after the Sustain effect. This setting is good when playing sustaining chords. (Fig 3: Level 5, Tone 6, Attack 5, Sustain 8)


  • Controls: Level, Tone, Attack, Sustain
  • Connectors: Input, Output, AC Adaptor
  • Current Draw: 10 mA (DC 9V)
  • Weight: 400g (15 oz.)
  • Recommended AC Adaptor: PSA Series


  • Black – Made In Japan
  • Black – Made In Taiwan
  • Silver – Made In Taiwan

The CS-3 was sold from September 1986 to present.