Auto Volume Adjust function
Music sources on the Internet such as streaming music distribution services and YouTube have various volume levels. It is troublesome to adjust the volume level each time you switch the source. This function automatically adjusts to about the same volume level when you switch to a music source with a different volume level.
Touch 
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appears on the display.
NOTE
When you use the Auto Volume Adjust function, set to the maximum volume level on the playback device. If the volume level on the playback device is small, this unit may not be able to recognize the volume level difference between the playback sources, making the Auto Volume Adjust function useless.