1) How to edit the sounds ingame?
There are many types of sounds, if you want to edit the music ingame you could find it in the next folder:
A)Sound => Music
Here you got all the songs that are played ingame. Pay attention some of them are used as background songs and others are used as environement songs. If you just change all the songs, to put songs to all of them, ingame you'll hear sometimes 2 songs being played in the same time. Which can be annoying because some people don't know how to take one of them off (yes it's sad but true).
The files in this folder are all in a WAV extension, so you have to convert your songs from any format to WAV. I am using and I recommand you to use "Mp3 Toolkit". It has many option of conversion, the free version allows you to do already many things with it.
B)Skills sounds and others
They are located in the previous folder so : " Sound"
Here it is a bit more complicated, they are in WAV format, that's true, but if you simply convert it into a WAV extension and run the game, it won't be working. Why ? Because those sounds have a different property which is :
Mono (not stereo like the music), 22050Hz (which is different also from the WAV-music files) and it's 32 bits !
For this, I recommand you to use "Audacity" which is a freeware on a beta version. But allows you to edit ANY kind of sound file and give you it's properties.
With this tool you can now edit any kind of sound ingame by it's good properties.
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Maybe that helps you^