The original Boss compressor. Optical circuit for unique, squashy attack.
Released in 1978. Notable for using photocouplers unlike the VCA-based CS-2/3. Determines the 'Boss Compressor' sound for many.

| Image | Name | Year Start | Year End | Made In | For Sale | Collection | View |
|---|---|---|---|---|---|---|---|
![]() | CS-1 (Silver Screw) Japan • Silver | 1978 | 1980 | 🇯🇵Japan | - | Details → | |
No img | CS-1 (Black Label) Japan • Black | 1980 | 1982 | 🇯🇵Japan | - | Details → |
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