Followed online instructions to convert song to ringtone for my iPhone. Converted song to ACC, 30 sec long, renamed to m4r. Copied to iPhone 'Tones' list. Ringtone is there, but in grey with small circle with arrows icon next to it. Its in 'songs' on iPhone, but not on 'Ringtones' list. Device was synced with iTunes. Can't get the ringtone to work. Any ideas?