Gsettings development

[Jason Benjamin <hexusnexus gmail com>]

I went to this website 
https://developer.gnome.org/gio/stable/GSettings.html to research 
development with gsettings.  I am trying to change a a value in 
gsettings (in this case "/org/gnome/desktop/sound/theme-name").  I am 
pretty sure all I will need are the functions g_settings_get_value() and 
g_settings_set_value().  I do not need to create any new keys, just 
modify existing ones.  Please point me to any resources or give me any 
short examples on how to do this.