![Smile :)](./images/smilies/icon_e_smile.gif)
http://isleoftune.com/apps/
I think, this should be possible for factorio, too. Items on belts can trigger sideway standing machines, which plays sounds. Or many other possibilities, inserters, factories, trees, water, different items make sounds...
What's needed to make such a mod?
Factorio needs to have a map-editor, in which you can fast switch to play the scene. While playing, you can also edit it (not all elements) during play. Then you can stop a nd edit the others. Switching between play and edit back and forth, you create the piece.