Master the Mix: Make Your Island Sound Professional

Imagine you are DJing a party. You want the music loud, but the talking quiet. The Audio Mixer device lets you do exactly that in Fortnite Creative. It groups sounds together so you can change their volume all at once. This makes your island sound like a real game, not just a collection of random noises.

What You'll Learn

• What an Audio Mixer is and why you need it.
• How to group sounds using Control Buses.
• How to use Verse to make the music fade out when players start fighting.
• How to build a simple "Stealth Mode" challenge.

How It Works

Think of your island's audio like a kitchen with many pots on the stove. You have a pot for footsteps, a pot for guns, and a pot for background music. If you want to make everything quieter, you don't touch each pot. You just turn down the main heat.

In Fortnite, these "pots" are called Sound Groups. The Audio Mixer is the main heat knob.

What is a Control Bus?

A Control Bus is like a labeled bucket. You put all your "footstep" sounds in one bucket. You put all your "music" sounds in another. When you turn down the bucket handle, every sound in that bucket gets quieter.

This is super useful for gameplay. For example, if a player goes into stealth mode, you want to hear less music. You can use Verse to tell the Audio Mixer to lower the "Music" bucket. The footsteps stay loud so the player knows where they are going.

Why Use Verse?

You can change volumes with devices in the editor. But Verse lets you do it automatically. Imagine a timer. When the timer hits zero, the Verse code tells the Audio Mixer to drop the music volume. This creates a dramatic moment for your players.

Let's Build It

We will build a simple "Boss Fight" setup. When a player steps on a trigger, the background music will fade out. This makes the fight feel serious.

Step 1: Set Up Your Sounds

1. Open Unreal Editor for Fortnite (UEFN).
2. Place a Music Player device on your island.
3. In the details panel, find the Bus setting. Set it to Music. This puts the music in the "Music" bucket.
4. Place a Sound Emitter device. Set its Bus to Effects. This is for gun sounds.
5. Place a Trigger Volume device. This will detect when players enter the arena.

Step 2: Add the Verse Code

Create a new Verse script. We will use the AudioMixer system. This system lets us change the volume of a specific bus.

Here is the code. Read it line by line.

# This script fades out music when a player enters a zone.

using { /Fortnite.com/Devices }
using { /Verse.org/Simulation }
using { /Verse.org/Simulation/Tags }

# This is our main device class.
# Place it in the editor like any other device.
BossFightScript := class(creative_device):

    # This is the trigger volume we placed in the editor.
    # Drag your Trigger Volume device into this slot in the editor.
    @editable
    TriggerVolume : trigger_device = trigger_device{}

    # This is the Audio Mixer device.
    # Drag your Audio Mixer device into this slot in the editor.
    @editable
    AudioMixer : audio_mixer_device = audio_mixer_device{}
    # note: audio_mixer_device manages sound buses via control bus mixes.
    # Use ActivateMix/DeactivateMix to switch between mix presets configured
    # in the editor. Volume changes must be wired via the Audio Mixer device's
    # mix settings in the editor (e.g., set the mix to reduce music bus volume).

    # This runs once when the game starts.
    OnBegin<override>()<suspends> : void =
        # Connect the trigger to our function.
        # When someone enters, run 'OnPlayerEnter'.
        TriggerVolume.TriggeredEvent.Subscribe(OnPlayerEnter)

    # This function runs when a player enters the trigger.
    # trigger_device events pass an optional agent, so we accept ?agent.
    OnPlayerEnter(Agent : ?agent) : void =
        # Activate the mix configured on the Audio Mixer device.
        # Set up your mix in the editor to lower the Music bus volume to ~20%.
        AudioMixer.ActivateMix()
        # note: To control a separate Effects bus, add a second
        # @editable audio_mixer_device for your effects mix and
        # call ActivateMix on that reference instead.```

### Step 3: Connect the Pieces

Code is just instructions. Now we need to give it the devices.

1.  In the editor, place the **BossFightScript** on an empty actor.
2.  Select the script actor.
3.  In the details panel, find the `TriggerVolume` slot.
4.  Drag your **Trigger Volume** device from the world into this slot.
5.  Drag your **Music Player** device into the `AudioMixer` slot.
6.  Make sure your **Music Player** is set to the `Music` bus.
7.  Play your island. Walk into the trigger. Listen to the music fade out!

## Try It Yourself

You did it! You made the music change with code. Now, try this challenge:

**The Challenge:**
Make the gun sounds get *louder* when the player enters the zone.

**Hint:**
1.  Add a second `@editable` `audio_player_device` variable called `EffectsPlayer`.
2.  Drag your **Sound Emitter** device into the new slot in the editor.
3.  Inside `OnPlayerEnter`, add a new line calling `EffectsPlayer.SetVolume(1.5)`.
4.  Run the game and shoot your gun!

Did it work? Great job! You are mixing audio like a pro.

## Recap

*   The **Audio Mixer** controls groups of sounds called **Buses**.
*   **Control Buses** let you change many sounds at once.
*   **Verse** can change these volumes automatically during gameplay.
*   You can create dynamic moments by fading music or boosting effects.

Keep experimenting! Try adding a "stealth mode" where footsteps get quieter too. Your island is getting more professional every day.

## References

*   https://dev.epicgames.com/documentation/en-us/fortnite-creative/using-audio-mixer-devices-in-fortnite-creative
*   https://dev.epicgames.com/documentation/en-us/fortnite/using-audio-mixer-devices-in-fortnite-creative
*   https://dev.epicgames.com/documentation/en-us/fortnite/using-audio-mixer-devices-in-unreal-editor-for-fortnite
*   https://dev.epicgames.com/documentation/en-us/uefn/audio-mixer-in-unreal-editor-for-fortnite
*   https://dev.epicgames.com/documentation/en-us/fortnite-creative/using-devices-in-fortnite-creative