 
 class UserDefaultsEventNotificationPreferences: EventNotificationPreferences {
 	static let notificationAheadIntervalKey = "EventNotificationPreferences.notificationAheadInterval"
-	static let notificationSound = "EventNotificationPreferences.notificationSound"
+	static let notificationSoundKey = "EventNotificationPreferences.notificationSound"
 	static let notificationsEnabledKey = "EventNotificationPreferences.notificationsEnabled"
 	static let instance = UserDefaultsEventNotificationPreferences(userDefaults: UserDefaults.standard)
 

		self.userDefaults = userDefaults
		userDefaults.register(defaults: [
			UserDefaultsEventNotificationPreferences.notificationAheadIntervalKey: 60.0 * 60.0,
			UserDefaultsEventNotificationPreferences.notificationSound: NotificationSound.Themed.rawValue,
			UserDefaultsEventNotificationPreferences.notificationsEnabledKey: true
			])
	}

	}

	func setNotificationSound(_ notificationSound: NotificationSound) {
		userDefaults.set(notificationSound.rawValue, forKey: UserDefaultsEventNotificationPreferences.notificationSoundKey)
		notify()
	}

