I've created a couple of custom ringtones for WP8 and configured them to be used.
So far, no problems.
However, these custom ringtones are much quieter than those that came with the phone.
I used MP3 Audio Editor to create these custom ringtones, and this allows me to double, treble, etc., the volume of the output MP3. When I do this and play the track on Windows I can clearly tell that the volume is increasing. But when played on the phone the volume doesn't appear to change and is constantly too low.
I've also ensured that I delete the previous version of the custom ringtone and re-started Settings > Ringtones just to be sure that it's playing the new version.
Does anyone have any ideas what else I can try?