Sets the value of the audio volume starting at the specified time.
- iOS 4.0+
- macOS 10.7+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 6.0+
The volume. The value must be between
The start time at which to set the volume.
This method adds a volume ramp starting at
time. This volume setting remains in effect until the end of the track unless you set a different volume level to start at a later time.