Okay so Sound Ninjutsu is pretty straightforward. You use chakra to create and manipulate sound waves to attack and defend. This Advanced Ninjutsu exists in three forms
Destructive Sound Waves: These sound waves are low in frequency but high in energy, so they're able to cause physical destruction to things they hit. Because they're physically destructive, they're visible as ripples in the air and are a bit faster than regular Wind jutsu.
Hindering Sound Waves: These pertain to sound waves that hinder the targets body by affecting things like his balance or disrupting his balance, etc. In this case, high frequency, low energy waves are used which travel at a virtually instant speed but lack any type of physical damage property. These types of Sound jutsu cannot effect the target's heart, brain or lungs nor cause direct damage.
Genjutsu Inducing Sound Waves: These pertain to using high frequency, low energy sound waves as mediums to induce genjutsu. Similar to the hindering sound waves, these cannot be avoided and their effects are immediate. Sound Genjutsu follows the normal release methods of regular Genjutsu.