everyone used Sky 7000 series all knew it has stereo (3D) ringtone. very interesting... sound very clear don't like another mmf file in mono. But i don't know how to make it, because some converter tools give very bad result, sound not clear, very low volume, and you always hear noise. if convert from midi to mmf ... always mono not stereo. anyone know the tools to convert midi or wav with stereo result pls help me.