Navigation through MERGING+NADAC menus is accomplished using the rotary button.
Pressing and releasing quickly or pressing and holding the button provide different results :

Short press the rotary button to access the Quick Control Menu. For example to toggle between the Main volume control to the Headphones Volume control, or to change polarity or Sources.
Long press the rotary button to access the General Menu, where you will be able to configure more MERGING+NADAC parameters.
Long press the rotary button to exit the current menu level and return to the previous level

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