The San Andreas FM station wasn't baked in, unlike its predecessors.

It featured dynamic playlists, randomized commercials, news and interview segments which reflected the progression of the game's arching plot and more.

https://www.soundonsound.com/people/allan-walker-craig-conno...

> In all the previous titles, each radio station was a loop of about an hour and a half with the adverts and the DJs all mixed in, so I could just EQ the whole thing the way I wanted. This time the tracks are selected randomly from each station's playlist and there are three different DJ intros and outros for each track. Most of the ads appear on several different stations too. We wanted people to be able to play the game for a long time before hearing anything repeated.