Yamaha AW2816 Owner's Manual page 310

AUX1–AUX4 screens
Additional functions in the Pre/Pst
pages
In the Pre/Pst page, you can press the [SHIFT] key to
assign the following functions to the [F1]–[F2] keys.
• [F1] (GLOBAL PRE) key
Sets all channels to pre-fader. This is the same
function as the PRE button in the GBL area (6).
• [F2] (GLOBAL POST) key
Sets all channels to post-fader. This is the same
function as the POST button in the GBL area (6).
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Reference section