In the last couple of days I am adding music and sounds to the game using FMOD (it is free for projects under 500K budget).
I am quite new with the argument but after I little bit I started to understand how to implement it.
Ramsey Johnson - https://soundcloud.com/ramsey-johnson and Adrian Karmanski https://soundcloud.com/user-590328532 created a FMOD project and I started to implement the sound in the game.
FMOD has a lot of features that can improve the quality of the sound, you can change speed of the sound, have multi instrument, define loop s,etc.
You have to add the unity package and select the project.
After you can add the FMOD studio Listener to your camera
and start to play.
You can add sound on event on any object, you decide which event play the sound and which events stop it.
On the "Event" you can see the same tree that you have in FMOD.
Of course you can play with code: I am following the steps on :https://www.fmod.com/resources/documentation-unity?version=2.0&page=examples-bas...
The idea is to change the speed of the sound when the player walk or run.
I will continue to work with it in the next days.