Each program features some forms of data communication, usually a text playlist of music played in each program, and an accompanying image.
The playlist might be useful for listeners to further investigate any artist/song heard on the show. The image from each broadcast can also serve as an “eQSL,” a self-verified record of reception, each unique to each listener’s conditions.
There are many free software applications for decoding these modes. Currently, FLDigi is quite useful,easy to use, and works with Win/Linux/Mac. And it’s open-source!
Another great option (from the same people) is TIVAR for Android devices. This is a easy way to give decoding a try, just by holding your phone/tablet near the sound coming from your radio’s speaker.