[rawdog805]

-First, you find the audio file that you want to be as your new TXT notifier, try to find it as any of the following file formats:

wav, mp3, aiff, m4a

-Then, load it into iTunes. Click on Edit > Preferences > Import Settings > Advanced, and set the conversion encoder to AIFF.

-Go back into your library inside iTunes, locate the file you just added, right click on the sound file you imported, and select "Convert to AIFF".

-Let it convert.

-Once it's done, right-click the file, and go to info. Follow the path to that file, and then simply rename it to *.caf.

-Open up iPhone Browser.
-Click on Goto Location > UISounds on the top bar.
-Locate the files named "sms-received1.caf", "sms-received2.caf", "sms-received3.caf", "sms-received4.caf", "sms-received5.caf", "sms-received6.caf". Decide which one you don't like, and delete it.
-Lets use the first one, "sms-received1.caf" as an example. Delete that ba$tard from the original directory.
-RENAME your NEW ringtone to "sms-received1.caf", and drag it into that iPhone Browser directory.
-Go to your iPhone, select "Tri-tone" as your message, and that will be your new SMS/TXT/MMS Ringtone.