My instrument is a guitar and I am here to tell you all about it with the instructions and how it works. How the guitar works is you pluck or strum the string and it vibrates which turns the vibrations into sound waves the sound waves then take a bumpy ride through the guitar and emits out of the guitar. After it pushes the air molecules in to each other which creates a collision.
The air molecules that are filled with sound travels through the different parts of our ears. Finally it sends our brain electric signals which we then recognize as sound. To change the pitch and frequency I will then pluck a different string that will be either shorter or longer. It also will change the amplitude if I strum it harder.