As a great example of audio storymaking that is also participatory, explore Frequency 2156
Frequency 2156 is a community based Internet radio from the post-apocalyptic future. Everyone alive and surviving can (and should!) publish radio messages. You can listen to the radio, which plays all the messages or you can browse a Message World Map for single messages from various locations. You can also send a request for a radio message to your fellow survivors all around the world. And of course, you can send your own radio message as well.
Here is the introduction to set the scene
Sample some sounds from the map, and try to find one that perhaps can tie into your own story idea, or maybe generates a new one. Share the link to one example that stands out to you as effective use of audio, or if you want to go the extra step, record your own transmission and add it to the map.
Example for "What Can You Hear from the Future on Frequency 2156?":