BYKI and Declan Software have iOs versions of audio flash cards. ‘Notes in Spanish’ has audio flash cards, too, but I don’t think they have a version for hand-helds. None is free, though each has a free demo of sorts. Don’t forget LingQ’s own Dictation exercise in the Vocabulary section.
However, none of these apps or applets encompasses the breadth of your notion. If I understand you correctly, Rick, you envision an all-audio LingQ. That would indeed be a very useful application to have.