For hackers:
The ringtones are in
/usr/share/sounds/jolla-ringtones/stereo/
in .ogg format.
One can store own ringtones in this directory.
The index of the ringtones is:
/usr/share/sounds/jolla-ringtones/stereo.index
In this index file there’s an entry for each tone, this way:
, {
"displayName" : "jolla-ringtones-the-first-one-alert-2",
"fileName" : "the-first-one-alert-2.ogg"
}
This can be added for new ringtones, or existing entries of unwanted tones can be edited to the new filenames and displaynames. Deleting old or unwanted sound files not necessary, they are small size.
TLDR:
I made a lot of tones out of cat and pet videos using Audacity, so I now have a cock for alarm clock, a cat meow for ringtone and hen cackle for SMS and messenger alarm.