The Amplitude Xtra allows
Director movies to respond in real time to the amplitude data derived from sound
cast members. The xtra sends amplitude values to Director while a sound is playing.
This means that, amongst other things, you can,

• control sprite animations
  and properties by synchronizing them to sound


• draw sound waveforms
  using normal Director sprites in real time at any resolution


• achieve lip-sync between
  animated characters and spoken dialogue


• change inks and blend
  properties in time with sound and music


• change sprite colors
  based on amplitude intensity

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