The ability to upload audio only to the profile sounds application is no longer possible in the latest release of the script, since the application was removed and replaced by an alternative, less functioning application. Any audio uploaded is now by default a part of the selection for profile sounds. As for albums, it is required for audio to be uploaded to an album, as noted from any experience with using the feature. I am not aware of any way around this.
If you only want people to be able to listen to music from their profiles, you can always try and "hide" the page from being viewed.
BoonEx Certified Host: Zarconia.net - Fully Supported Shared and Dedicated for Dolphin