I know this is almost 5 years old... However, I stumbled upon something that supports EMV's answer.
RØDE made a hot lap recording of a GTR and also showed a setup for consumers without a massive budget.
Setup with iPhones and SmartLav+:
Pro setup hot lap:
You can use a telephone pickup-coil to record (plug it into the "mic" jack on your tape-recorder) or amplify (plug it into the "mic" jack on your amp) phone conversations; you can also use one "in reverse" (i.e., plug it into the "ear" or audio-output jack of a sound-player, such as a radio, cassette-deck, etc.) to ...