190-01879-11 GMA 245/245R Installation ManualRev. 6 Page 2-62.9 Configuration, and Adjustment OptionsThe GMA 245 has several configuration/adjustment options (see Section 2.9.6). These configuration/adjustments are as follows:• Wired Telephone Volume• Auxiliary 1 Volume• Auxiliary 2 Volume• Auxiliary 3 Volume• Alert 1 Volume• Alert 2 Volume• Alert 3 Volume• Alert 4 Volume• Speaker Volume• Master Avionics Squelch (Section 2.9.1)• High Cockpit Noise Option (Section 2.9.2)• Music In Isolation Option (Section 2.9.3)• Alerts Mute Music Option (Section 2.9.4)2.9.1 Master Avionics Squelch (MASQ) FunctionMASQ functions to prevent low level noise from being passed to the headset ear speakers, this is known as“squelching” or muting the audio. To “break” or “open” squelch means that enough audio signal is presentthat the signal is passed through and can be heard. Increasing this setting increases the signal levelrequired to break/open squelch. If needed, adjust the MASQ SQ level so the audio background noise ismuted.2.9.2 High Cockpit Noise OptionEnable to help reduce intercom background noise in very high noise cockpit environments. Disabled bydefault.2.9.3 Music In Isolation OptionEnable to allow pilot and copilot to hear selected music when PILOT or CREW isolation mode is active.Disabled by default.2.9.4 Alert Mute Music OptionDisable this option to prevent music from being muted when alert audio is heard. Enabled by default.
