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Increasing gain adds distortion, or an overdriven rock tone; decreasing gain produces a cleaner sound. 5. TONE Turn right to add treble/reduce bass. Turn left to add bass/reduce treble. 6. POWER Turns amplifier on/off. 7. POWER ADAPTOR INPUT A power adaptor is NOT included. As an alternative to two 9V batteries, it is possible to power this amp with an adaptor. IMPORTANT - use only a 14V, 500mA adaptor with this amplifier (sold separately). INSTALLING BATTERIES The MA003 Amplifier opera