Horizon Radio

Play your own music through Forza Horizon 6's in-game radio.

Features

• Radio Replacement
  • Streams through the actual in-game radio so station switching, volume, and HUD all keep working
• Sources
  • Local (folders, M3U playlists, single files)
  • YouTube (videos and playlists)
  • Spotify Connect
• Mixes
  • Cross-source playlists: combine tracks and playlists from different sources into one continuous stream, with two-level shuffle. Build them in the Mixes tab and tune to one from the player bar.
• Shuffle
  • Toggle on the Now Playing page for local-file and YouTube playback (remembered across runs)
• Track Metadata Sources
  • MusicBrainz
  • Spotify
• One-click mod installer
  • Detects your Forza installation and handles the DLL
• Live dashboard with throughput, gain, and underrun stats

Setup

In FH6's audio settings:

• Radio DJ: Off

Installation

1. Download the latest zip from Releases.
2. Unzip anywhere and run HorizonRadio.UI.exe.
3. Open the Mods tab → Install.
4. Launch Forza Horizon 6.

Building

Details

Build	Produces	Requires
CMakeLists.txt	version.dll + test exe	Windows: VS 2022 Build Tools. Linux/macOS: clang + mingw-w64. CMake ≥ 3.25, Ninja.
HorizonRadio.UI.slnx	C# UI	.NET 10 SDK

git clone https://github.com/dhkatz/horizon-radio.git
cd horizon-radio
cmake --preset windows-x64
cmake --build --preset windows-x64-release
dotnet build HorizonRadio.UI.slnx

To produce a release zip locally:

dotnet publish HorizonRadio.UI/HorizonRadio.UI.csproj -c Release -r win-x64 --self-contained
# Output: build/release/HorizonRadio.zip

For architecture, internals, code-quality tooling, and maintenance runbooks (including how to re-derive the FMOD offsets after a game update), see AGENTS.md.

Credits

Details

_Libraries_

• librespot - Spotify Connect client (Rust)
• ShadUI - UI framework (C#)
• SharpHook - cross-platform global keyboard/mouse hooks (C#)
• SDL3-CS - SDL3 bindings for controller/wheel/joystick input (C#)

Assets

• Kenney Input Prompts - keyboard/mouse/controller glyphs in the Controls tab (CC0)

References

• Spotify Radio - Original inspiration (closed source)
• fh6-universal-radio - Cross-referenced for FH6's FMOD function signatures and RadioStreamFmod chain offsets, and adapted its lazy-resolve createDSP technique.

License

GPLv3 — see LICENSE.