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6. The EFFECT BYPASS footswitch allows you to bypass the effects if your hands are not free to push the button. 7. The EFFECT SEND jack is for sending audio signals to an external effects device. 8. The EFFECT RETURN jacks bring the audio from an external effects device back into the GigaMix. MAIN 1. The Graphic Equalizer shapes the sound of the Main mix before it is sent to the main speakers. 2. The PHANTOM POWER button provides a 48-volt source for microphones. 3. The RUMBLE FILTER helps filte