To turn on the mixer and audio system, you can use the white switches located near the 220V power outlets, provided for powering any instruments and accessories. Do not use other power buttons located on the mixer, which should always remain with the switch in the On position. Before connecting your Jack or XLR/Cannon cables to the available channels, make sure that the volumes of the individual channels and the “Main” volume (located bottom right on the mixer) are set to zero. After connecting your instrument or microphone to one of the channels, you can test it by raising the volume of the individual channel and the “Main” volume. Also, make sure not to set the gain knob of each channel to zero (it’s the red knob at the top, located just below the channel inputs).