A few users have been reporting problems importing ringtones from AudioExplorer+, getting an “Unable to Download Ringtone” error message like the one below:
So far I haven’t been able to find out the problem here. Setting the iPhone in safe mode (i.e. with the SBSettings tweak, which is available for free in Cydia, as in this video: http://www.youtube.com/watch?
I myself haven’t had this problem with ringtones (just occasionally with iTunes imports) and I think for most users both imports work fine.
Ringtones require conversion to AAC/m4r before importing, the conversion is handled by Michael Tyson’s TPAACAudioConverter library. I doubt the library is the problem, but it’s worth looking into, as the code is a bit old and may have problems with newer versions of iOS. A good way to test this would be to import a file that is already in the AAC format (i.e. files with the following extensions: “m4a”, “m4b”, “m4p”, “m4v”, “3gp”, “mp4”, “aac”) and see how the ringtone export works with that.
UPDATE: One user who was having this problem on iOS 6.1 solved it by “by updating to 6.1.2 and re jail breaking.”