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13. [REVERB] control This control enables you to adjust the reverb effect. Turn the knob clockwise for more reverb. 14. [CHORUS] switch This switch turns the chorus effect on and off. When the switch is turned on, the indicator above the switch lights up. 15. [MASTER] volume control This control enables you to adjust the overall volume level of the Normal and Tube Pre channels. NOTE:The [MASTER] volume control does not affect the signal level at the [DI OUT], [TUNER OUT], [AUX IN] or [LINE IN] c