This is genius. I've enjoyed Radio Garden on occasion for the musical novelty but never thought about putting a random station in Latin America on to practice listening to different Spanish accents.
Thanks! One note is that if you're listening to a country's flagship broadcaster - like BBC - they will use a standardized form of the language in their news, etc. I find those stations are best for learning the official tongue in a clear, systematic way. But if you're advanced enough to want more conversational and informal forms - you mention learning different Spanish accents - non-flagship broadcasters might have more of that.
Of course the news on any station is going to use more formal language, and the entertainment programming even on the flagship is going to use less formal. Just, the talk station from a flagship broadcaster - like BBC Radio 4 - is going to have the most bang for your buck in language instruction.
