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Look up onMXR Bass OverdriveMint condition with original box. Very musical and expressive overdriven tones. The "clean" knob acts as a blend to further sculpt the sound.From MXR site:"The MXR Bass Overdrive is an original design that delivers warm, tube-like overdrive. Along with standard Volume, Tone and Drive controls, this pedal features a Clean control so you can blend a pre-set EQ clean signal with the overdrive signal, resulting in sweet burly bass overdrive."

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