An annoying trend amongst some low budget Indie games on Steam, including RADical ROACH Deluxe Edition, is missing volume/sound settings. This means that if you want to have this game open while doing something else (for whatever reason) then you have to suffer the obnoxious music.

Using Windows sound mixer you can mute only RADical ROACH Deluxe Edition, here's how.

1. Right-click the speaker icon in the bottom right of Windows
2. Select Open Volume Mixer
3. Find RADical ROACH and reduce it's volume with the slider

This is useful for temporarily idling in a game for an hour, for whatever reason you want might to idle in this game, you can turn the volume back up once you're done.