I tried it with a folder called ringtones, but my Eris did not recognize the folder or the mp3's in it (the droid & imagio did though). I made a folder in my music folder called ringtones and selected the ringtone from the drop down list. The only problem with that is that you have to scroll through all of your music you loaded on the SD Card. Not happy with that result, i go on to try using ringdroid (which is real easy to use), but find the ringtones i've just made are not loud enough. I go looking for the new ringtones i've just made (so i can get rid of them), and find them in a new folder called media which was created by ringdroid, the path to the created ringtones on the SD Card is media>audio>ringtones. I've since placed all my custom ringtones in said folder, now my custom ringtones show up with the htc/android ringtones.