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"Spark Digital is the world's first studio-grade condenser microphone to offer both USB and iPad connectivity. Expanding on the professional and sound of Blue's Spark XLR studio microphone, Spark Digital features the same studio-grade condenser capsule and hand-tuned components for high-fidelity recording and consistence performance in any situation- vocals, drums, piano, speech, location recording and more. Spark Digital also includes the Focus Control, providing two different sonic options in one mic at the push of a button. Complete with an adjustable desk stand and built-in shockmount, Spark Digital also includes y-cables for each platform with a headphone jack for zero-latency real-time monitoring. With a full range of recording capabilities, Spark Digital turns your iPad into a true mobile studio. System Requirements iPad: iPad and iPad 2 PC: Windows 7, Windows Vista, XP Home Edition or XP Professional USB 1.1/2.0; 64 MB RAM (minimum) Macintosh: Mac OSX (10.4.11 or higher) USB 1.1/2.0; 64 MB RAM (minimum) "

"There are too many posts on alt.noise concerning how to build contact microphones, and to my knowledge, nobody ever posted a page like this in response. Plenty of bad advice out there... Hopefully this page is a little more useful than some of the responses I have seen over the years. If you actually follow these directions, please e-mail me and let me know where they're flawed/lacking. This is one way to put together a contact microphone. It is not the best way, but the end result is pretty satisfying. And it doesn't cost much (once you have a soldering iron). "

Advice and information on how to use external microphones for the iphone4, iPad, and iPod touch to record audio.

"So, you want to make a contact microphone? Whether you want create noise music by banging on scrap metal, cheaply and easily amplify your acoustic instrument, or just play with wires, you're in the right place. You will need: piezo transducer (radioshack 273-073A) 1/4″ audio cable (eg radioshack 42-2381A) tape, solder, hot glue, heat shrink tubing, etc"

"There are plenty of online guides for making contact microphones from piezo discs to listen to the microscopic vibrations of objects. (Steve Schaberg's guide is great for first-time builders, as is Furious Contact Mic Assembly.) My version includes a limiter to protect sensitive mic inputs from high-voltage spikes. There are many better designs, including fully buffered FET preamps, but if you're looking for a "Radio Shack" solution hat won't fry sensitive mic inputs, this will do!"