These are the default audio files which have been modded. This is NOT a system wide audio hack. For that check out Viper4Android.
This will overwrite files on /system/media/audio partition and should be flashed in recovery only.
Audio Bump to Full Dynamic Range (No crackling sound)
Dropbox - https://www.dropbox.com/s/u7iruechb4...amic_Range.zip
Audio Bump to 150%
Dropbox - https://www.dropbox.com/s/j36hma4xei...st_150perc.zip
Audio Bump to 200%
Revert back to Stock
Dropbox - https://www.dropbox.com/s/dqyeaxi54k...nds_Revert.zip