How does Russolo understand sound and noise? Has this changed your understanding of it?

Russolo explains the difference between noise and sound.  He writes that noise is constant in our life, and sometimes unpleasant, yet familiar.  Sound is removed from our every day life, a foreign and musical experience.  

How is he using language to make this essay a sonic experience?

He uses intense imagery and very specific language to arouse certain emotions and cause readers to imagine very specific sounds to accompany these words.  

What are the "categories of noises" that he describes?

The categories of noises that Russolo describes are noises that are completely organic and unable to be accurately reproduced by technology or machinery.  Noises like snores, whispers, gurgles, moans, sobs, etc. cannot be replicated by anything non-human.