Remove old custom ringtones
I have a new PC and new install of iTunes. I see that 12.7 iTunes has changed the way you add custom ringtones to your iPhone but I can't get rid of the old custom ringtones still on my iPhone. They do not show up in iTunes > Device > ringtones, only the new one I have added by copy and paste.
Anyone tell me how to remove a ringtone from iPhone 6S when it doesn't show in iTunes?