Add few new features to existing music ios player app and upload it to appstore

Its about existing ios IPAD app, that can play mp3/wav files. What i need is to add feature- to can play 2 stereo mp3/wav files TOGETHER- instantly by clich to selected song, but first mp3/wav audio (stereo) to be redirected to Headphones jack, second mp3/wav audio to be redirected to Lightning audio to have some like 4channels audio .