Toa D-2000 Series - Manual (Page 116)

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Function key function assignment: Monitor Clear
Assign the monitor channel selection clear function to the function key.
Click each function key's Function button to select "Monitor Clear" from the pull-down menu.
Function key function assignment: External Control Switch
Assign the external control switch function to the function key.
Click each function key's Function button to select "External Control Switch" from the pull-down menu.