If the mic-in is incorporated into the headphone port as I think it is, it would be more like the headphone/headset jack on the iPhone and probably some other phones. There are four separate signals running through the iPhone jack: stereo out, mic in, and control signal-in. The signals can be split if you make the right cable for it. (The reason Im talking about the iPhone is that this issue has come up for multitrack recording apps on the iPhone.) The old video iPod runs a video-out signal in place of the mic-in signal on the iPhone, so if you pick up the video iPod to composite audio/video cable, the signal running through the composite video output is actually capable of running audio-in instead. I hope that makes sense.'SuperRoach' said:cobaltage mentioned that the pandora has a mic-in ... I totally didn't realise, but that is awesome if true! Is it a general purpose port? in other words, can the amp be disabled to allow it to become a line-in style input for a mixing board input.
It'd be a dream come true to have this connected up as an backup recorder or even better, a shoutcast streamer
However, I wouldnt necessarily think a microphone from a headset is going to perform better than a built in microphone. I have recorded myself playing guitar with both the iPhone internal mic and the mic on the Etymotic HF2 headphone/headset, and the Etymotic mic is too sensitive and not necessarily better than the built in mic. It would be possible to build a break-out box or to use a specially made cable to run into a mini-mic amp, maybe. But that is hardly going to be portable, unless you put in some time and do it right.
In the end, though, I think USB audio is kind of the way to go, for simplicity and also for XLR inputs with phantom power. A couple companies make single-mic XLR to USB adapters with headphone out for monitoring. (Like the one that you can buy with Indamixx, which is a Linux based touchscreen DAW.) Those are about as small as you can get for a single normal-sized microphone. I feel like there has to be some kind of USB audio interface that works with Linux already, since some people use desktop Linux for DAW work.
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