The two simplest approaches are to use the iPhone to capture some decent video and either a portable recorder like a Zoom H1 or H2n (workable) or H4n (better) or a digital mixer or analog mixer with USB connectivity (even better) to capture the audio. Then you edit, mix, and synch the audio and video on your computer.
With an H4n, just to give you an example, you can feed the vocal mic and guitar pickup (or mic) from your mixer into the two separate mic input channels, while also capturing the room sound with the onboard stereo mic pair. Then you can mix, edit, and otherwise process those tracks using a DAW before you synch it with your video. A digital mixer or analog mixer with at least 4 channel USB connectivity can give you a similar multi-track recording to process and synch with your audio. The tricky thing will be achieving adequate vocal/guitar separation if you're using a mic to amplify your guitar.
In a venue with good acoustics and a reasonably quiet ambience, however, you can get a good recording using something as simple as the stereo mics on an H1 or H2n--or even the separate stereo mic pair that Zoom makes for iPhones. Also: if you want to get fancy, you can set up two or even three iPhones in different locations, capturing the same performance, so you can later edit them together to get a multi-camera effect.
Louis
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