Behringer ddx3216 Instructions Manual page 6

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Use the SUBW LEV to adjust the level of the signal relayed to the subwoofer
output (bus 16). The PRE switch or the POST fader have the same function as
described above (see also ch. 4.1).
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The functioning (and the switch position) of these parameters is identical to
the ROUTING LEVEL and PRE/POST parameters in channel routing menu
(see ch 4.1).
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Additionally, the display has a surround MUTE switch per channel, and is
active in the factory default (i.e. mute = on).
Even when MUTE is deactivated, the signal may still be inaudible. Either the
CHANNEL MUTE key is active or the CHANNEL MUTE AFTER FADER
function (see chapter 12.3.2) under Setup Preferences is not correctly set.
If the latter is active, POST fader signals (sends/busses) and non-PRE fader
signals are muted through the CHANNEL MUTE key.
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