Toa D-2000 Series - Manual (Page 111)

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Function key function assignment: Line Input
Assign the line input function to the function key.
Step 1. Click each function key's Function button to select "Line Input" from the pull-down menu.
Step 2. Click the Parameter button to select the line select number from the pull-down menu.
Step 3. Click the Position button to select the unit and slot in which the corresponding D-936R or D-937SP is
mounted from the pull-down menu.