title: Tap pressure strength detection using accelerometer
body: <p>Yesterday, in the presentation about the new Garageband for iPad 2, Apple demoed an interesting feature: The detection of the tap pressure by using the accelerometer. (See the drums section on the <a href="http://www.apple.com/ipad/from-the-app-store/garageband.html" rel="noreferrer">Garageband page</a>.) </p>
  
  <p>I'm wondering how that's supposed to work if the iPad lays flat on the table. No movement, no measurable acceleration, no?</p>