Why does my S4 play ringtones instead of text alert sound, won't change?

[AC Question]

S4 plays ringtone instead of text alert sound, won't change

For my Galaxy S4, I have a downloaded ringtone for all calls except from my wife. It insists on playing that tone instead of a basic simple tone for text alerts. I've already tried turning it off the usual ways - going thru the settings for the phone or messaging settings. No success. Any other ideas?