---
title: Audio
slug: legacy-docs/audio
docTags: 
createdAt: 2025-03-11T06:56:07.599Z
---

:::hint{type="warning"}
This page / section pertains to **BrightAuthor Classic**, our legacy app. **BrightSign Author **is our latest app for managing content and players.

Development of BrightAuthor Classic has largely ceased and the app will eventually be deprecated and replaced with BrightSign Author.
:::

Use the **Audio** tab to configure audio mixing and output options:

- **Audio Configuration**: Configure the audio routing for the presentation:
  - **Mixed Audio PCM Only**: Multiple PCM audio sources (for example, from a video and audio file playing simultaneously) will be mixed into a single source for audio outputs. Differing sampling rates (e.g. 44.1 kHz vs. 48 kHz) will be merged into a single rate of 48 kHz. This setting also allows for dynamic adding and removing of audio sources while audio is already playing.
    - **Auto level volume**: Check this box to level all PCM audio streams on a particular audio output to a similar volume level.
  - **Mixed Audio PCM / Compressed**: The behavior is the same as the **Mixed Audio PCM Only** setting, but compressed audio is supported as well.
  - **Fixed Audio**: Audio sources are mixed only if their sampling rates match. If you attempt to add or remove audio sources while audio is playing, playback will fail.

:::hint{type="info"}
The **Mixed Audio **options require firmware version 7.0.x or later, while the **Fixed Audio **option is the legacy behavior.
:::

- **Audio**: Set the **Minimum Volume** and **Maximum Volume** for the audio output (0 – 100).
- **HDMI**: Set the **Minimum Volume** and **Maximum Volume** for the HDMI**®** output (0 – 100).
- **SPDIF**: Set the **Minimum Volume** and **Maximum Volume** for the SPDIF output (0 – 100).

:::hint{type="warning"}
The **Maximum Volume** settings for **Audio**, **HDMI**, and **SPDIF** will be overridden by other volume settings in a presentation, including the **Initial Volume** setting for a zone and volume commands attached to events or states.
:::

![](https://api.archbee.com/api/optimize/511c8QBH-VHiwWnyzIwUb/o-DYeuCH8K18UCuY6gckt_presentation-properties-audio.png)