Welcome, paverman! If you want to add anything (sounds, wav files, songs, whatever) it's very simple. Just mount your Droid and create a directory called "media" directly on the SD card. Then in the media directory create a subdirectory called "audio". Then in the audio directory create three subdirectories called "notifications", "ringtones", and "alarms". Then just drop your files into the appropriate folder, and assign ringtones to contacts, email, and the alarm clock.
For notifications: media/audio/notifications
For ringtones: media/audio/ringtones
For alarms: media/audio/alarms
That's worked for me and after few months I've had no issues at all. Each assigned ringtone works each time and shows up on the correct list of choices. It's that easy! You should be all set!
:welcome: