The rarest Boss compact. A parametric EQ with fixed Q, often used as a 'cocked wah' boost.
| Image | Name | Year Start | Year End | Made In | For Sale | Collection | View |
|---|---|---|---|---|---|---|---|
No img | SP-1 Spectrum (Freq), Balance (Mix) | 1977 | 1981 | 🇯🇵Japan | - | Details → |
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