From what I noticed, Russolo sees and understands sound and noise as if they are completely man-made and can only be comprehended by man. He has stated that nature is generally quiet so the only time noise is audible is when it's intentional. I think he makes a very good point, most sounds that are made are made by humans. Music probably would not exist if it wasn't for humans and our technology.
How is he using language to make this essay a sonic experience?
He uses onomatopoeia effectively for action sounds in order to describe a scene and provide depth. The words he is using as onomatopoeia can only be translated as such through the reader's experiences with such sounds. If the reader never heard a BOUM sound prior to reading the article, the reader may not comprehend the scene that is trying to be portrayed by the author. He also includes verbal dialogue to add what the characters in his narrative may be thinking or saying.
These categories of noises are noises that are currently not able to be reproduced through human technology, or mechanically. The categories appear to be: noises that are created from primarily the environment, noises that can be made from animals that are not necessarily voice but are through the mouth and have a mild volume, sounds made from humans generally and are low in volume, sounds that often come from the environment when influenced by a creature's action, unique percussive sounds, and uncommon animal/human sounds that are often higher in volume.