7-35
Editing Audio
Fades and Crossfades
Pro Audio provides several commands for applying gradual volume
changes to audio data. The Þrst command, Fade/Envelope, lets you fade
in or fade out, and lets you choose an envelope, a curve that governs the
rate of the fade. The starting envelope can be linear (straight line),
exponential, or inverse exponential. You can change the shape of the
envelope before applying the fade.
The envelope in the Fade/Envelope dialog box is made of one or more
connected line segments (the linear curves are a single segment, the
exponential curves consist of nine segments each). Although the
endpoints of the curve are Þxed, you can move the intermediate points,
and create new intermediate points, to change the shape of the curve.
The second command, Crossfade, lets you create a smooth transition
from one audio event to another, by fading two overlapping audio events
simultaneously (one fades out, the other fades in). As with Fade/
Envelope, you can choose from three different starting curves and
change the shape of the curve.
In the Audio view, fades can also be applied graphically with the Draw
Line tool. For more information, see ÒBasic Audio EditingÓ on page 7-11.
To do this... Do this...
Move a point Click and drag it to a new location
Insert a new point Click on the line between existing points
Remove a point Drag it onto the next point
Restart from the original curve Click Reset
To Apply a Fade to Audio Data...
1. Select the audio data to be affected.
2. Choose
Edit-Audio-Fade/Envelope
, or right-click in the Audio
view and choose
Fade/Envelope
from the menu, to open the
Fade/Envelope dialog box.
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