@Farinhir
There are two ways to get the radio louder:
1. In the Audio Settings menu you can put the Radio Volume to max and lower all the others. ( I prefer period music to in-game "mood" music so I actually uncheck it.)You might have to raise the Master Sound Control. It's a bit of trial and error, but all the levels can be accessed in-game via "escape" so a few minutes fiddling mught give you an acceptable result.
2. Process all your audio files into Mp3s and then use a batch "Volume Gain" program to increase their volume by several dBs. For my "Instant Radio" files I increased the volume of the tracks to 96.5 from an average of around 85. I don't think there's a batch gain-changer for .ogg files, or wavs - only mp3s.
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