This mod is created to replace the generic male voice 6 with Majima Gorou. So if you love his voice from various Yakuza games, you will love this mod. 

In order to install this, you need to download the file you'll find in this app, which is the full version of the mod. You can then install it in your game. It's the same for the sound effects, you need to download the sound effect file you'll find here, and then you can install them in your game.