It is helpful to study music to a certain amount to be able to have a point of view about handling it on a music station.
The dynamic range of music refers to the ratio between softest quiet and loudest blast. In a composer's score a very soft passage is marked pianissimo, as quiet as possible. The loudest possible playing is marked fortissimo. There are terms for various levels in between.
The reason the original Italian words are preserved is so that musicians all over the world can follow the same set of instructions.
Of course the original music notation method was developed around acoustical instruments.
During the decades when music was played by trained musicians a large orchestra understood how to pull back during a vocal so the singer could be heard clearly without having to scream.
Since the age of untrained musicians, who might know a few chords, electronic instruments and 3,000 Watt amplifiers have led to instruments playing at maximum fortissimo so that singers need to scream if they are to be heard at all.
Luckily there are still a few musicians around who still understand how to balance their performance, but the public seems generally oblivious to such fine points and themselves prefer to crank it up when listening.
For radio there is no one size fits all processing scheme, it all depends on what kind of music is being played.
There are purists who believe that nature's original dynamic range should be preserved, and I disagree with them, because radio listeners are not sitting in the perfect acoustics of Carnegie Hall. Listeners are surrounded by world noise, and the radio station needs to compress and limit just to maintain a listening threshhold to get the program through the background noise.
Best thing is to tinker with the processor over a long period of time, listen to the result in different places and on different radios. You'll be satisfied at times, at other times you'll feel the need to change it.