VolumeChangeEvent
public class VolumeChangeEvent : CurrentTimeEventFired when PlayerEventTypes.VOLUME_CHANGE occurs for the THEOplayer.
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                  The new value, between 0 and 1, of the player’s volume. DeclarationSwift public let volume: Float
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                  The new value, between 0 and 1, of the device’s volume. DeclarationSwift public let deviceVolume: Float
