This script adds 3 new keybinds to allow the following functions in-game:

- Increase radio volume
- Decrease radio volume
- Mute the radio

No need to keep opening the sound settings to adjust the volume.

In the F1 menu you will see the current volume displayed as the keys are pressed, then it will fade away after a few seconds.

You can find the keybinds under:
Settings → Controls → Radio Volume Keybinds