A Google developer, formerly on the Android team, provides a detailed, fair, and clear explanation of how iPhone OS 4 multitasking will work. Robert Love explains the difference between true background application multitasking and Apple's limited set of APIs that let certain processes continue to operate in the background. He also differentiates serialization (quitting an app while preserving its state precisely) and true background operations. follow link
Simulate Multiple Simultaneous Effects in Game Your Video
Although you cannot overlap two audio/motion effects at the same time in Game Your Video, you can always re-edit the video to create stunning effects. So, if you are editing a dance video, for instance, and have applied the Echo effect to one of the dance moves, you can edit the video again to apply a Slow Motion effect as well, for a great result.
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- ExtraBITS for 12 April 2010 (12 Apr 10)
Google Developer Explains iPhone OS 4 Multitasking