This story, a letter to Radio World from an engineer, outlines how there's an answer to every problem - even if it's not always obvious. It concerns a Texas jazz radio station, whose on-air staff kept complaining about a mysterious microphone hum that always appeared when they went on air. 

The engineer at KJAZ couldn't find anything and couldn't even hear it - until one day, the answer became obvious. It's not a local story, but it's a fun little tale that could only have happened in radio. 

What’s That Mysterious Humming Sound?