However old your iPhone is, it records great audio. You can use it as a dictaphone, to make field recordings of ambient sounds, to “tape” music, and even sample everyday noises and make music from them. But how do you do it? How do you hook up, say, a portable keyboard or an MP3 player to your iPhone, and actually save a recording? Let’s see.
How to record any audio on your iPhone

Photo: Charlie Sorrel/Cult of Mac