In the context of audio essays and/or podcasts, captured sound or captured audio refers to any audio element that is not part of the spoken word or accompanying music, but is nevertheless an intentional addition on the part of the producer. For example, if you’re producing an audio essay about construction workers, you might intentionally go out and record the sound of heavy machinery, hammering, a truck backing up, or the sound of bricks being dropped in a pile. Those recordings become one of your assets for producing your multimodal project.
Musicians sometimes use “found sound,” also known as found objects or ambient audio, just like another musical instrument. Hip hop artists sample beats from other recordings, re-mix them, and make them part of new compositions. Captured audio works similarly in audio essays and podcasts.