You can apply envelopes to individual events. Envelopes, known as ASRs (attack sustain, and release) give you the ability to control an event's fade-in, fade-out, and overall level.
When you create an event, handles are added that are used to set the envelope. As you drag these handles, a volume envelope appears.
Choose Edit > Mode > Event (or click the Event Mode button in an editor's playbar) to enable event-editing mode.
Hover over the top of an audio event.
When you see the envelope cursor (), drag the volume line to the desired level. As you drag the envelope, the event’s gain is displayed in dB.
Hover over the upper-left or upper-right corner of an audio event until the fade offset cursor is displayed .
The fade handle is displayed in yellow when no fade is present:
. . . and is displayed in green when the fade is too small to be displayed:
Click the corner of the event and drag to create a fade.
To remove a fade, drag the end of the fade curve back to the edge of the event.
Right-click the fade-in or fade-out area to display a shortcut menu.
Choose Fade Type from the shortcut menu and choose a fade curve from the submenu:
If you want to change the default fade type that is used when fading an event in or out, choose Options > Event Default Fade In or Default Fade Out and choose a fade curve from the submenu.
The fade curve you choose will be used for new fades (existing fades are unaffected).