You can modify the intensity contour of an existing sound.
While the pitch and duration of a sound can be modified with the ManipulationEditor (see Intro 8.1. Manipulation of pitch and Intro 8.2. Manipulation of duration), the modification of the intensity curve is done in a different way.
You can create an IntensityTier with the command Create IntensityTier... from the New menu. With View & Edit, you can add points to this tier. You can then "multiply" this tier with a sound, by selecting the Sound and the IntensityTier together and clicking Multiply. The points in the IntensityTier represent relative intensities in dB; therefore, the sound pressure values in the Sound are multiplied by 10(dB/20).
Instead of an IntensityTier, you can use an AmplitudeTier; when you click Multiply for a selected Sound and AmplitudeTier, the sound pressure values in the Sound are directly multiplied by the values in the AmplitudeTier.
© ppgb, January 28, 2011