.........ALWAYS MAKE YOUR BACKUPS BEFORE MODDING ANYTHING!........
First up is the custom on/off lock screen sounds by a guy over on the Sprint S4 forum by the name of dav3wash so don't forget to hit that thanks button when you get over there.
1)Pick and download any of the Lock/unlock sounds you wish from the link below.
2)Extract the Lock.ogg and unlock.ogg from the zip and place on sd card in a new folder named whatever you wish.
3)With any file explorer with root access Navigate to [System / system / Media / audio / ui]
4)Scoll down til you see Lock.ogg and unlock.ogg
5)Delete or move stock sounds to the folder you made in step (2) (Incase you want to go back to stock).
6)Place custom Lock.ogg/unlock.ogg where the stock ones were shown in step (3)
7)Back out of file explorer and reboot your device.
8)After reboot Navigate to [Settings / device / lock screen / unlock effect / and set to ripple/ink] and your good to go!!!!!
Hope you enjoy these sounds!!!
If for any reason you would like to go back to stock the link below is the stock lock.ogg/unlock.ogg zip. This zip is non-flashable and must be pushed the same way you pushed the custom sounds. https://www.dropbox.com/sh/iw4u1ak89...WPOLNfJ5a?dl=0