Press this button to attenuate the input level by 20 dB. This button is generally used when the ambient noise is high and the device level noise is high or the level is too high. Use this button to attenuate all frequencies of the audio input signal to filter out the low-pitched noise or electrical noise. Sometimes the input level signal is too high. If the attenuation is not performed, the control range of the attenuator is greatly reduced, and it can only slide in a small area, making it difficult to operate the volume output control. This button should be pressed at this time to increase the effective control range of the attenuator.
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