I know a lot of people here ask for some sort of EQ or at least presets to adjust the balance but honestly I would be happy with you just reducing the treble on FM radio. Nothing fancy, just make it like it is on music playback. I cannot understand why there is such a big difference. Not to mention that radio volume goes up like two times higher than music playback. Why don't I have the same loudness while listening to my own music that I have when listening FM radio ? But I digress.. please remove some of the treble from the FM radio, It hurts our ears to just listen at normal volume. I have to turn the volume down just to be bearable - at which point I can barely understand the people speaking on the radio over the noises of the traffic.
Sena 30k has too much treble on FM radio