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G3X/G3X Touch Install Manual - GDU 4XX Config and Post Install Checkout
Rev. AC
Page 34-117
Alert Source
–If more than one GDU 4XX is installed, an Alert Source field will appear on the SOUND
Configuration page. The Alert Source item may be configured so a single specific GDU always outputs
alert audio. Or, the Alert Source item may be configured to "Auto", which will cause whichever display is
present to output alert audio, in the following priority order: PFD1, MFD1, PFD2, MFD2.
Alert Output
–If set to Mono & Stereo, alert tones and messages will be output on both the mono and
stereo outputs. If set to Mono Only, alert tones and messages will be output only on the mono output.