It seems the sound is too quiet on systems with stereo sound because of the 5.1 surround sound videos. This can be fixed by downmixing the videos to stereo. If you don't know how to downmix you have two options:

• Download replacement videos someone else has already downmixed (10 GB download)
  
• Follow the instructions in this guide to downmix them on your own computer, which takes a couple of minutes

I have slow internet so I opted to downmix them myself, and I'm a massive nerd, so I did it using free software and a bit of scripting - which means you can do it too!

We'll be using "ffmpeg" to do the hard work here. Download ffmpeg from the official website.[ffmpeg.org]

Extract the zip file you get, and put the "ffmpeg.exe" file in Darksiders' videos folder. On my machine, that's "C:\Program Files (x86)\Steam\steamapps\common\Darksiders Warmastered Edition\media\videos".

Now create a text file in that same folder and name it "fix.bat". In that file put:

If you've done the setup right your videos folder should look like this (with ffmpeg and fix.bat):



Now double-click "fix.bat" and it will create fixed versions of all the videos in the new folder "fixed".

Now move all the videos with names like "Scene_xx.wmv" to another folder as backups, just in case something went wrong and you need to undo all this.

Lastly, take all the files in the "fixed" folder and move them into the videos folder.

Ta-ta! We're done. Now when you play the volume should be much more balanced :)

Big shout out to Fhaarkas who did all the brainwork of figuring out this fix in the first place!