"DeepSound is a freeware steganography tool and audio converter that hides secret data into audio files. The application also enables you to extract secret files directly from audio files or audio CD tracks."

Pretty cool huh?

https://github.com/Jpinsoft/DeepSound

https://null-byte.wonderhowto.com/how-to/hacks-mr-robot-hide-data-audio-files-0164136/