Download a CM ROM, and use a root browser to replace all the folders in /system/media/audio with the ones from CM.
This method will be tedious, but it will work.
I think you'll need to fix the permissions.
You'll also have to change some stuff in your build.prop to match your new audio files. Like the default notifications.
You could also just copy all the sounds you want and have both TW and CM.
Replace all the files in the ui folder to get all CM system sounds.
Sent from my SPH-L720 using xda app-developers app
Devices: Samsung Epic 4G Touch, Asus TF700T, Sprint Samsung Galaxy S4, Galaxy Gear Watch
PM me of you're interested in Phantom Hackers last release of Gingerbread Blazer ROM for the E4GT.
TF700: ROM: Negalite WondeROM 4.3
ROM: CROMi-Xenogenesis 5.1 Kernel: KT-SGS4-JB4.3
Kernel: 3.1.10 _that OC+ Modem: MK2