---
title: "Configuring I/O"
slug: "configuring-io"
updated: 2026-10-26T18:36:16Z
published: 2026-10-26T18:36:16Z
canonical: "docs.telosalliance.com/configuring-io"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.telosalliance.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Configuring I/O

Properly configuring the Omnia XII for your broadcast system is essential for achieving optimum performance and maximum on-air quality and loudness.

Configuring I/O can be done remotely using the web UI, and in more limited cases from the front panel touch screen. When the touch screen does not support a workflow, it is noted in this article.

## Accessing I/O Controls

The **FM/HD Processing** page provides controls for configuring input, output, and MPX settings.

**To access I/O configuration controls (in the web UI):**

1. Launch the web UI.
2. Click **FM / HD Processing**.

The header includes tabs for **PROC**, **IN**, **OUT**, **MPX**, **Analytics**.

![](https://cdn.document360.io/57e3cd80-d493-453c-9672-ad1b043dadc3/Images/Documentation/FM HD Proc Header.png?sv=2026-02-06&spr=https&st=2026-11-10T17%3A00%3A55Z&se=2026-11-10T18%3A00%3A55Z&sr=c&sp=r&sig=%2BWOLRy2PownsWcchO03pgmBoPQLktQd%2BhdaWEJs%2FOoU%3D)

FM/HD Processing Header

The middle section changes depending on the selected header tab:
  - **Proc** displays preset, Quick Tweak, and Expanded processing controls
  - **In**, **Out**, and **MPX** display a single flow diagram with tabs that provide access to the corresponding I/O controls
  - **Analytics** displays four analysis scopes
3. Click the menu tab for the control type you want to adjust.

## Adjusting I/O Controls

I/O controls include switches, drop-down menus, knobs and faders.

**To adjust a control (in the web UI):**

- Click a switch to toggle between **ON** and **OFF**.

![](https://cdn.document360.io/57e3cd80-d493-453c-9672-ad1b043dadc3/Images/Documentation/Switch.png?sv=2026-02-06&spr=https&st=2026-11-10T17%3A00%3A55Z&se=2026-11-10T18%3A00%3A55Z&sr=c&sp=r&sig=%2BWOLRy2PownsWcchO03pgmBoPQLktQd%2BhdaWEJs%2FOoU%3D)

Adjusting a switch
- To select a drop-down menu item, click the menu, and then click the desired setting.

![](https://cdn.document360.io/57e3cd80-d493-453c-9672-ad1b043dadc3/Images/Documentation/Dropdownmenu.png?sv=2026-02-06&spr=https&st=2026-11-10T17%3A00%3A55Z&se=2026-11-10T18%3A00%3A55Z&sr=c&sp=r&sig=%2BWOLRy2PownsWcchO03pgmBoPQLktQd%2BhdaWEJs%2FOoU%3D)

Selecting a drop-down item
- To change the value of a knob setting:
  1. Click the knob to activate it for adjustment.

The current value is displayed below the control.

![](https://cdn.document360.io/57e3cd80-d493-453c-9672-ad1b043dadc3/Images/Documentation/Knob(1).png?sv=2026-02-06&spr=https&st=2026-11-10T17%3A00%3A55Z&se=2026-11-10T18%3A00%3A55Z&sr=c&sp=r&sig=%2BWOLRy2PownsWcchO03pgmBoPQLktQd%2BhdaWEJs%2FOoU%3D)

Activating a knob for adjustment
  2. Adjust the value by performing one of these steps:
    - Use a mouse wheel.
    - Click-drag the mouse to the right to increase the value or left to decrease it.
    - Click on the displayed setting, type in a value, and press Enter.
- To change the value of a fader, perform one of these steps:
  - Hover over the fader or fader lane (displayed in blue) and use a mouse wheel.

![](https://cdn.document360.io/57e3cd80-d493-453c-9672-ad1b043dadc3/Images/Documentation/Fader and Fader Lane.png?sv=2026-02-06&spr=https&st=2026-11-10T17%3A00%3A55Z&se=2026-11-10T18%3A00%3A55Z&sr=c&sp=r&sig=%2BWOLRy2PownsWcchO03pgmBoPQLktQd%2BhdaWEJs%2FOoU%3D)

Fader
  - Click-drag the mouse up to increase the value or down to decrease it.
  - Click in the fader lane to jump to a new value.

![](https://cdn.document360.io/57e3cd80-d493-453c-9672-ad1b043dadc3/Images/Documentation/Lane.png?sv=2026-02-06&spr=https&st=2026-11-10T17%3A00%3A55Z&se=2026-11-10T18%3A00%3A55Z&sr=c&sp=r&sig=%2BWOLRy2PownsWcchO03pgmBoPQLktQd%2BhdaWEJs%2FOoU%3D)

Fader lane
  - Click on the displayed setting, type in a value and press Enter.

![](https://cdn.document360.io/57e3cd80-d493-453c-9672-ad1b043dadc3/Images/Documentation/Fader Box.png?sv=2026-02-06&spr=https&st=2026-11-10T17%3A00%3A55Z&se=2026-11-10T18%3A00%3A55Z&sr=c&sp=r&sig=%2BWOLRy2PownsWcchO03pgmBoPQLktQd%2BhdaWEJs%2FOoU%3D)

Fader setting

## Configuring Omnia XII Input

Input configuration consists of assigning audio sources to Omnia XII back-panel input connections and configuring those inputs for your **Preferred Mix** (primary audio) and **Fallback Mix** (backup audio).

The input paths for controls receive audio from physical inputs or internal sources. The selected input feeds the Omnia XII processing chain’s internal mixer, which then drives the configured outputs.

The **Preferred Mix** and **Fallback Mix** are configured independently. An input can be assigned to the **Preferred Mix**, the **Fallback Mix**, both mixes, or neither, depending on your system design.

Internal input paths include:

- **Analog:** Audio fed from the back panel **Analog Left** and **Analog Righ**t inputs
- **AES 1**, **AES 2 and AES 3:** Audio fed from the respective back panel **AES** inputs
- **AoIP 1 and AoIP 2:** Audio received from configured Livewire+ AES67 network streams
- **Playout:** Audio (such as emergency audio, backup audio), fed from the internal backup player
- **HLS+ (HTTP Live Streaming):** Audio fed from the optional stream receiver

> [!WARNING]
> Important! During this workflow, make sure any faders carrying active audio that are not being used as a Preferred Mix or Fallback Mix are set to OFF.

**To configure Omnia XII input (via the Omnia XII web UI):**

1. From the **FM / HD Processing page**, click the **IN** tab.

This provides a view of I/O header meters, vertical input meters in the next panel, block diagram menu tabs in the middle panel, and respective menu controls in the bottom panel.

![](https://cdn.document360.io/57e3cd80-d493-453c-9672-ad1b043dadc3/Images/Documentation/In default.png?sv=2026-02-06&spr=https&st=2026-11-10T17%3A00%3A55Z&se=2026-11-10T18%3A00%3A55Z&sr=c&sp=r&sig=%2BWOLRy2PownsWcchO03pgmBoPQLktQd%2BhdaWEJs%2FOoU%3D)

Input controls, Inputs tab selected

1. Set the monitor path: At the top of the middle panel, click the **Monitor** drop-down menu and select a monitor path (such as **FM Output** or **HD Output**).

This selects where in the Omnia XII signal path you monitor audio. Paths such as **FM Output** and **HD Output** include Omnia processing, whereas **PreProc Out** provides signal before processing (effectively acting as a bypass control).
2. Drive the input for the preferred mix with typical program material at a normal operating level. You should see meter activity on the bar graph meters.
3. Adjust the monitor output level (located to the right of the **Monitor** drop-down menu as needed at this time and when adjusting input controls in subsequent steps.
  - Click on the fader and drag toward -10 to lessen the level or toward 10 to increase the level.
  - Click in the field to the right of the fader, type a value, and press Enter.
4. In the middle panel, click the **Inputs** tab, and set the provided controls for the back-panel, playout, or stream receiver connections you are using for your preferred (primary) mix or fallback (secondary) mix.
  1. Enable **Invert L** and **Invert R** if needed.
  2. Click the **Stereo Mode** drop-down menu and select the desired mode: **Stereo**, **Mono L**, **Mono R**, **Mono** **Sum**, **Swap**, or **MTX**.

Select **MTX** when the input source carries matrix-encoded stereo audio rather than conventional left/right stereo.
  3. Adjust **Right Trim** if needed.

> [!NOTE]
> **Note:** If the incoming left and right channel levels are not balanced, adjust the **Right Trim** control for the input source. This control lets you change the level of the right channel so that it matches the left channel.
5. In the middle panel, click the **Preferred Mix** tab and configure the back-panel connection that supports your primary audio sources. This is your main input source.
  1. Configure only the back-panel connections that should participate in the **Preferred Mix**. Set the **Level** and **Fade Time**:

Adjust the input level so that the peak-reading **IN** bar graph meters read just into the yellow (about -15 to -12 dBFS).

> [!NOTE]
> **Note:** The individual input meters (Analog, AES 1, and so on) are pre-fader. The IN bar graph meters are post-fader.
  2. Set all faders that are not part of the **Preferred Mix** to **OFF**.
6. In the middle panel, click the **Fallback Mix** tab and configure the back-panel connections that supports your backup audio sources. Configure only the back-panel connections that should participate in the **Fallback Mix**.
  1. Set the **Level** and **Fade Time**:

Adjust external device levels feeding the Omnia XII so that the peak-reading **IN** bar graph meters read just into the yellow (about -15 to -12 dBFS).

> [!NOTE]
> **Note:** The individual input meters (Analog, AES 1, and so on) are pre-fader. The IN bar graph meters are post-fader.
  2. Set the back-panel connections that are not part of the **Fallback Mix** to **OFF**.
7. Configure additional input features as required.
  - **Failover:** Settings for switching to your backup system audio (fallback mix) when the preferred mix is not detected. See *Configuring Failover Emergency Audio*.
  - **Patch Return:** Insert point settings, primarily for use with an external watermarking encoder. See *Using a Watermark Encoder*.
  - **HLS+:** Settings for using a stream receiver as an input source. See *Configuring HLS+ Audio*.
  - **Playout:** Settings for audio (such as emergency audio, and backup audio) fed from Omnia XII’s internal audio player. See *Setting up Emergency Playout*.

## Configuring Outputs

Output configuration consists of assigning audio sources to the Omnia XII output connections and configuring the settings for each output in use. Output connections include the back-panel analog and AES outputs, front-panel headphone output, and AoIP outputs.

**Prerequisite:** Play typical program material through the Omnia XII.

**To configure Omnia XII output (using the Omnia XII web UI):**

1. From the **FM / HD Processing page**, click the **OUT** tab.

This provides a view of header meters, vertical output meters in the next panel, block diagram menu tabs in the middle panel, and respective menu controls in the bottom panel.
2. Set the monitor path: At the top of the middle panel, click the **Monitor** drop-down menu and select a monitor path (such as **FM Output** or **HD Output**).

This lets you define where in the Omnia XII audio chain you are monitoring locally. Paths such as **FM Output** and **HD Output** include Omnia processing, whereas **PreProc Out** provides signal before processing (effectively acting as a bypass control).
3. Adjust the **Monitor Output** level to a comfortable listening level.
  - Click on the fader and drag toward -10 to lessen the level or toward 10 to increase the level.
  - Click in the field to the right of the fader, type a value, and press Enter.
4. Configure program delay (if applicable):

The delay settings are primarily used in the field to align the timing of FM analog and HD program paths with other equipment in the transmission chain. Delays are set in seconds, milliseconds, and samples. This control is not included with the front panel touch screen.
  1. Click the **Prog Delay** tab in the middle panel.
  2. Configure the **Diversity Delay** and **HD Diversity Delay** as required for your transmission system. The **FM Diversity Delay** setting is for the analog FM path only. The **HD Diversity Delay** setting is for the HD path only.
5. Configure back-panel outputs and the front-panel headphone output.
  1. Click the **Back Panel** tab in the middle panel.
  2. For each output you are using, set the **Source**, **Level**, and **Right Trim**. For the **AES** outputs, you can also set the **Sample Rate**. For **Headphone** output, selecting **Monitor Point** for the source gives you the use of the Patch points **IN** setting for the processing chain. Otherwise, you can select **FM** (with or without pre-emphasis) **HD** output, or the **FM Patch** output, or create a calibration tone.
6. Configure AoIP output channels.
  1. Click the **AoIP** tab in the middle panel.
  2. For each AoIP output you are using, set the **Source**, **Level**, and **Right Trim**.
7. Configure AoIP senders (Omnia XII web UI only)

This control gives you up to three discrete Livewire streams, via the three back panel **NET** connectors. (The output **Source** selector for each AoIP channel drives the respective AoIP sender.
8. Verify that normal program material is present and that the configured outputs indicate audio on the output meters.

## Configuring Omnia XII MPX Composite Output

MPX composite output configuration consists of configuring FM options, basic RDS settings, stereo generation, and routing the resulting composite signal to physical and IP-based outputs.

**To configure Omnia XII MPX composite output (using the Omnia XII web UI):**

1. From the **FM / HD Processing page**, click the **MPX** tab.

This provides a view of header meters, two scope meters (**MPX Spectrum** and **MPX Scope**) in the next panel, **Monitor** controls and a block diagram with menu tabs in the middle panel, and respective menu controls in the bottom panel.
2. Set the monitor path and **Monitor Output** level as needed.

See *Configuring Outputs*.
3. Configure FM Options:
  1. Click the **Pre-emphasis** drop-down menu and select the pre-emphasis you want to apply to the composite output (75 or 50 µs), or select **none** for no pre-emphasis.

For the transmission side of conventional FM broadcasting, some form of high-frequency boost, or pre-emphasis is used. Be sure to select the pre-emphasis that is correct for your country. For North and South America, 75 µs is used. In Europe, Australia and New Zealand, 50 µs is employed. The factory default pre-emphasis setting is 75 µs. The pre-emphasis selection affects the operation of the audio processing and is applied to the composite BNC, discrete, AES/EBU digital and Livewire FM channel outputs. The HD channel outputs are never pre-emphasized.
    - > [!NOTE]
> **Note:** Normally, the none selection under the Pre-emphasis options would not be used in conventional FM transmission applications. It is provided in instances where processing of a flat signal is desired. One example would be when preprocessing prior to a satellite uplink in distributed radio networks.
  2. Ensure the **Test Tone** drop-down menu is set to **Off** for normal use. When needed, select **L Only** to send a test tone to the left channel of the composite output.
4. Configure basic RDS settings.

You can set RDS settings in the web UI only. These configuration controls are not included in the front panel touchscreen.
  1. Click the **RDS Gen** tab in the block diagram.

The **RDS Dashboard** page opens. It includes tabs for **RDS Dashboard**, **Basic RDS**, **Metadata**, and **Settings**.
  2. Click the **Basic RDS** tab and configure the settings.
  3. Click **Save RDS** to save the settings.
  4. Return to the **MPX** settings page in the web UI.
  5. For additional RDS settings, see *Setting up the Built-in RDS Generator*.
5. Configure the Stereo Generator:
  1. Click the **Stereo Gen** tab in the block diagram.
  2. Set the **SCA 1 Input Gain** and **SCA 2 Input Gain**, as needed.
    - If your internal equipment (like an RD encoder) is already calibrated to match the transmitter’s expectations, set the gain to 0.
    - If the subcarrier signal is under-driving the injection mix, scale the voltage digitizing behavior up or down.
  3. Set the **Pilot Level**.

This control sets the 19 kHz pilot injection level up to 12.0%, in 0.1% steps, relative to 100% modulation. To defeat the pilot, adjust the control to 0 and the pilot will be off.
  4. Adjust the **Stereo Generator Modulation** if needed.

This sets how intensely the audio and data signals push the transmitters RF carrier deviation (where 100% modulation typically equals ± 75 kHz deviation).
  5. To enable single sideband suppressed carrier (SSB) technology, click the **SSB Mode ON/OFF** switch so that **ON** is displayed. SSB Mode uses a single-sideband, suppressed-carrier L−R stereo signal that can help reduce multipath effects and provide increased protection of the FM multiplex baseband. Verify that its use complies with the requirements of your country's broadcast regulatory authority before enabling it.
6. Configure back-panel MPX controls:
  1. Click the **Back Panel** tab in the block diagram.
  2. In the **Composite** section, configure **Composite 1** and **Composite 2** (signal from the respective back-panel BNC connectors).

Note: Composite output levels are adjustable from **0 to 10 V**.

**Important:** Use typical program material and a calibrated modulation monitor when adjusting composite output levels. Reference line-up tones cannot be used to set 100% FM modulation because a steady-state tone does not represent the peak modulation characteristics of normal program audio.
    - Select the desired **Function** (**MPX** or **19k Pilot**).
    - Set the output **Level** for each composite output.
7. Configure **MoIP Sender** (web UI only):

The **MoIP Sender** distributes the composite MPX signal over IP (MoIP) at 192 kHz, 16-bit to the µMPX encoder elsewhere in the system.
  1. Click the **MPX Sender** tab in the block diagram.
  2. Click the **Enabled** switch so that it is set to **ON**.
  3. Click the **Payload Type** drop-down menu and select a type.
  4. In the **Address** field, type in an AES67 IP multicast address.
  5. Enter a port number in the **Port** field, or use the up/down arrows to adjust the value.
  6. Click **Save**.