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Tap pressure strength detection using accelerometer

I've found the video introducing iPad2. http://www.youtube.com/watch?v=_nP_hhrkdrE

at 3:40, when you hit on the drum harder, the louder the sound produced.

I've kept search a lot on Apple developer's API and cannot find such techniques, so how to do so?

Thanks!

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chakming
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  • using accelerometer only sense **the first time pressure only**, as Joe Blow answered below, and that's not what I need. And the topic is related to accelerometer only. is there other methods to sense the pressure without using accelerometer? – chakming Mar 12 '11 at 11:50
  • Duplicate: http://stackoverflow.com/q/5179426/388318 – Karl Mar 12 '11 at 08:53

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