Assertion: overdrive pedal | /r/HasProperty | parametric equalizer
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text: Boss's line of compact pedals began in 1977 with the release of six pedals, all of them discontinued: an overdrive pedal (OD-1), a phaser pedal (PH-1), a parametric equalizer called the Spectrum (SP-1), a 6-band graphic equalizer (GE-6), a compressor pedal (CS-1) and an automatic wah pedal (TW-1).