Drive [Q] How to change the "screen tap" sound?

BEFORE YOU READ ANYTHING, please note that I have ALREADY TRIED to no avail.

Hi guys,

If anyone could please help me with this, that'd be great. So, I have mounted /system as read-write numurous ways, a terminal emu, an app, and adb. I also heard somewhere that "chmod 777 /system" may help with permissions. I did all that. Second, I mounted using ES and retrieved my own sound to replace "TW_Touch" and "S_HW_Touch.ogg." However, once the copy/paste operation is complete, if I try to play the file to make sure it worked, there's no sound in the file anymore. Basically the file is silenced the moment it goes into /system/media/audio/ui. Can anyone help me here?

Thanks in advance,