To start, you need to first locate the appdata folder for Underspace. For Windows, this can be found in AppData/LocalLow/Pastaspace Interactive.

Create a folder within this directory and name it "Music". Within the music folder you can then create additional folders. Each folder within the Music folder is considered its own radio channel. You can swap between these radio channel folders in game using the plus (+) or minus (-) keys by default.

The red underline is the folder itself, the green highlighted folders are radio channels.

Within each radio channel folder you can place a.ogg, or .wav file and the radio channel will recognize it as a song and play it when activated.
Due to how the importer works, music MUST be in signed 16 or 32-bit PCM encoding, otherwise it won't import. Audacity can help with this.

However you can also specify subfolders within the radio channel folder. Any music placed in these folders will play in matching situations, these are:

AMBIENT: Music in this folder will play in nebulas, asteroid fields, and space stations.
BATTLE: Music in this folder will play during combat.
BOSS: Music in this folder will play during bossfights, starchases, and climatic situations.
DANGER: Music in this folder will play when hostiles are near, but not yet engaged.
EXPLORE: Music in this folder will play when exploring open space.

The files in orange would play randomly, any files in the blue folders will play in specific scenarios.

Once in game, pressing the plus (+) or minus (-) keys will cycle through your radio stations. You can see the current radio station that's active in the top right corner.


.wav and .ogg can be finnicky with Unity's audio streaming systems. If you load the game and you see the words "NO VALID MUSIC" this means the format is wrong. Again, you need to check the format.

And that's it! Enjoy space music in space.