First of all, SSH into your Iphone. (I use FileZilla cause it is more in depth to see files, but you could use whatever you desire, Winscp, etc.) Keep in mind I am working with Windows, I'm unfamiliar with MAC options, but you MAC users know where to go.)
Next, minimize FileZilla, (or whatever you are using) and create a file in your My Documents section titled, "Iphone Unlock Sounds".
Then search your Iphone directory via System/Library/Audio/UI Sounds, in there there will be a file called, unlock.caf. Take this file, and drag, copy, or upload it into your file you previously created, called, "Iphone Unlock Sounds." This will preserve the original unlock sound, should things go wrong, (or the **** hits the fan, as they say).
After this, right click unlock.caf in your Iphone directory, and then delete the file.(It's ok, don't sweat it, remember, you already save it man.)
Next, well I probably should have told you to upload the file I have attached first, but hell with it, now minimize FileZilla, or whatever drug of choice you are using. Then upload my chainsaw file. Save it to your desktop. Unzip it, and then on your desktop, rename it, unlock.caf.
Now, here comes the fun part. OPen up FileZilla again, or as I said, whatever drug of choice you are using, and get back to System/Library/Audio/UI Sounds, (that is if you are disconnected.) Just by minimizing it, does not disconnect you, so you should stay continuously connected.
Now, once you are in the UI Sounds directory, drag your newly created chainsaw file, remember renamed unlock.caf, on your desktop, and pull it into your UI sounds file directory of the Iphone.
At this point, refresh the screen before doing ANYTHING, this helps, and GOD knows why.
After that, shut down the phone, wait a minute or two, then restart it.
Once it totally reboots, you'll be wackin' the hell out of the unlock mode with your new CHAINSAW SOUND!!
I've been DRinkin' a little, so let me know if all is well, if not I will repost.
Also have live Rooster crowin' unlock sounds, for real live ferocious dog unlock sounds, live grenade sound with breakin' glass, and other wild sh@$!!!!!
Hope it works for ya'
Later,
Butch