I thought this might be of interest to some in this group. At
myPhoneFiles.com there is new software that let you create your own voice ringers out of CD tracks, MP3 and Wav files, or record your own voice.
There are actually two different apps. One is Voicetones Studio and it pretty much does what the above, and the other is Sing-A-Ringtone - with the last one you can add your own voice over any MIDI or MP3 (or Wav, or OGG, etc.) file.
You can test your phone at
http://myPhoneFiles.com/test. It already tested ok with Sprint phones (PCS Vision), and Motorolas (V300-V600), as well as some Nokias. Even some Verizon phones work too: namely LG VX6000 and Audiovox 8900. Enjoy!
maciej