
HTC Mogul / XV6800 / PPC6800 / P4000
Sound Notifications
http://www.zamzar.com/ »
it is free, you choose the files you want to use as a ringer, or sound notification, upload it to the website they will send you a link to download the file in the new format you asked for at the upload, download it and either to connect the phone to the computer or even just your memory card, if you have a card reader available, copy the new file to the windows folder on your mogul.
then, on your phone click
start -> settings -> sounds & notification
choose the notification tab, and choose the event you want to change the sound for, and from the pull down menu choose the new sound, make sure that "play sound" is checked.
good luck with that