This guide assumes that you already have at least a basic knowledge of C#, and have set up a modding environment as explained on this wiki.

Adding your own jukebox track to the game as is simple as including an audio file (.mp3 or .wav) in your C# Project and then defining a corresponding ModJukeboxTrack class to go with it.

ModJukeboxTrack

Common Overrides

AudioClipName: This is the name of the AudioClip that your track will use. By default, all .mp3 and .wav files in your project get embedded and put into AudioClips of the same name (but without the file extension). If you have MainThemeBTD5.wav in your project, you'd put MainThemeBTD5 as your AudioClipName. The default value is just the name of your class, so you could also just have your class name be MainThemeBTD5 and you wouldn't even need to override this.

DisplayName: This sets the name that will be shown to users from within the Jukebox UI.

AssetBundleName: If instead of loading from an embedded audio file you want to load from an embedded Unity AssetBundle, put the name of the bundle here (not including the .bundle extension). Then, AudioClipName will be used as the name of the asset it tries to find within your bundle. In this case, it may include the file extension, depending on how the bundle is setup.

AudioClip: If you want to implement more advanced functionality for where it gets its audio clip, you can override this property to change it from having the default behavior that's described for the above two properties.

Examples

With a project structure like

| MainThemeBTD5.cs
| MainThemeBTD5.mp3
| VolcanoThemeBTD5.cs
| VolcanoThemeBTD5.mp3

And ModJukeboxTrack classes defined as so

internal class MainThemeBTD5 : ModJukeboxTrack
{
    public override string AudioClipName => "MainThemeBTD5"; // could be omitted because the default is the class name
    
    public override string DisplayName => "Main Theme - BTD5";
}

internal class VolcanoThemeBTD5 : ModJukeboxTrack
{
    public override string AudioClipName => "VolcanoThemeBTD5"; // could be omitted because the default is the class name
    
    public override string DisplayName => "Volcano Theme - BTD5";
}

You should have the result

Being able to see and add the newly added Jukebox tracks to your playlist