A: To use an external mic, you will need a preamp for it, or at least a self-powered mic. You will plug it into the line input, and select “External Mic” in AudioTools.
A: Two reasons. First, size. To make the chassis small enough to hold with an iPod touch or iPhone in one hand, we needed to keep the depth small. Second, we are not powering the mic with standard phantom power, so we don’t want people accidentally plugging in a normal microphone.
A: While playing music, 40ma average is typical. Max is around 80ma, driving headphones with a maximum-signal sine wave.
A: You will get a warning message saying that the device was not designed to work with iPhone, and that you should turn on Airplane mode to reduce the possibility of picking up noise. The device will work, and will not damage your iPhone, but will pickup radiated cell phone noise.
A: The grounding scheme of iAudioInterface is very finicky, so we need to float those connectors.