I've used a Zoom H4n to record digital audio to go along with digital video from a Nikon HDSLR. Its called double system audio in the film industry. I synchronize them in Final Cut Pro X but you can do this with most decent video editing software. "Slating" both camera & DAR at the top of the recording helps the s/w match files effectively.
I'm sure you can use the Zoom H4n to record performance audio using the x/y configure mics. I plan on using it this summer when I attend a songwriting camp.
You said you can plug the Zoom H4n into your iPhone or iPad in the original post but I've never done that so can't comment on that use.
Take care,
Frank
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