# AUDIO CONTROL

### MICROPHONE SELECTOR BUTTONS <a href="#microphone-selector-buttons" id="microphone-selector-buttons"></a>

* Related communication channel is enabled for transmission and reception.

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### AUDIO CONTROL BUTTONS <a href="#audio-control-buttons" id="audio-control-buttons"></a>

* Related audio channel is enabled for reception.
* Automatically activated when a transmission channel is selected.

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### SATCOM CONTROL BUTTON <a href="#satcom-control-button" id="satcom-control-button"></a>

* <mark style="color:red;">Unavailable</mark>

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### PASSENGER ADDRESS CONTROL BUTTON <a href="#passenger-address-control-button" id="passenger-address-control-button"></a>

* <mark style="color:red;">Enables PA announcements. It deactivates the microphone selector button and in this case no radio transmission occurs since there is no VHF/HF/SATCOM microphone selection.</mark>

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### SERVICES INTERPHONE CONTROL BUTTON <a href="#services-interphone-control-button" id="services-interphone-control-button"></a>

* <mark style="color:red;">**EMER:**</mark> <mark style="color:red;"></mark><mark style="color:red;">Enables communication with flight attendants during emergency situations. When selected a green bar flashes on the button. Once the flight attendant picks up the call the green bar flashes faster. Pressing the button again, the light becomes steady and the communication with the flight attendant is enabled. A triple HI/LO chime sounds.</mark>
* **RAMP:** Enables communication with ground personnel. <mark style="color:red;">For an incoming call, the ramp annunciator flashes and remains steady when active. Communication through the ramp interphone remains active unless PTT or PA PTT is activated, ramp resumes when PTT or PA PTT is released.</mark>

{% hint style="info" %}
If you click on the RAMP button the MSFS ATC window will open so you can call ground services.
{% endhint %}

* <mark style="color:red;">**CAB:**</mark> <mark style="color:red;"></mark><mark style="color:red;">Enables communication with flight attendants during normal situations. Works the same as EMER mode. Communication through the cabin interphone remains active unless PTT or PA PTT is activated, cabin resumes when PTT or PA PTT is released.</mark>
* <mark style="color:red;">RAMP and CAB can be selected at the same time.</mark>

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### MASTER VOLUME CONTROL KNOBS <a href="#master-volume-control-knobs" id="master-volume-control-knobs"></a>

* Allows adjustment of the most recently selected audio.

<figure><img src="https://docs.flightsim-studio.com/api/document/image/6feebe9e-1ab0-40aa-9630-f011c6327528/cf68afad-4613-4cb5-a4aa-230cb6df6d2d/fc8cd1c3-deeb-470d-837b-0346e8d592f8.png?width=589" alt="" width="589"><figcaption></figcaption></figure>

### ID FILTER BUTTON <a href="#id-filter-button" id="id-filter-button"></a>

* <mark style="color:red;">Activates a filter that eliminates voice on VOR and ADF audio so the identification can be heard.</mark>

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### AUDIO SELECTION BUTTONS <a href="#audio-selection-buttons" id="audio-selection-buttons"></a>

* <mark style="color:red;">Enables the respective audio to be summed into the output on the cockpit speaker (SPKR), interphone (INPH), or headphone (HDPH).</mark>

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### ACP DISPLAY <a href="#acp-display" id="acp-display"></a>

* Displays the selected transmission channel and digital volume information.

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### AUTO/MASK MICROPHONE SWITCH <a href="#automask-microphone-switch" id="automask-microphone-switch"></a>

* <mark style="color:red;">AUTO (PUSH IN): allows audio communication via oxygen masks.</mark>
* <mark style="color:red;">MASK (PUSH OUT): activates oxygen masks microphone when auto mode fails.</mark>
* <mark style="color:red;">Oxygen mask stowage box doors must be closed and reset in order to enable hand or headset microphone booms after using the oxygen mask microphone.</mark>

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### BACKUP VOLUME CONTROL BUTTON/KNOB <a href="#backup-volume-control-buttonknob" id="backup-volume-control-buttonknob"></a>

* <mark style="color:red;">NORM (PUSH IN): normal operation mode.</mark>
* <mark style="color:red;">BKUP (PUSH OUT): restores VHF communication in case of digital audio system failure.</mark>

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### SELCAL ANNUNCIATOR BUTTON <a href="#selcal-annunciator-button" id="selcal-annunciator-button"></a>

* <mark style="color:red;">Unavailable</mark>