         if context == &Observation.Context {
             if keyPath == Observation.VolumeKey,
                let volume = (change?[NSKeyValueChangeKey.newKey] as? NSNumber)?.floatValue {
-                NotificationCenter.default.post(name: .SystemVolumeMonitor, userInfo: ["volume":volume])
+                NotificationCenter.default.post(name: .SystemVolumeMonitor, userInfo: ["volume": volume])
             }
         } else {
             super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)


    public override init() {
        super.init()
        
        AVAudioSession.sharedInstance().addObserver(self,
                                                    forKeyPath: Observation.VolumeKey,
                                                    options: [.initial, .new],
                                                    context: &Observation.Context)
    }
    
    deinit {
        AVAudioSession.sharedInstance().removeObserver(self,
                                                       forKeyPath: Observation.VolumeKey,
                                                       context: &Observation.Context)

                                                         mode: .default,
                                                         policy: .longFormAudio)
        try? AVAudioSession.sharedInstance().setActive(true)
        
        //Prevent interruptions from incoming calls - unless user has configured device
        // for fullscreen call notifications
        if #available(iOS 14.5, *) {
            try? AVAudioSession.sharedInstance().setPrefersNoInterruptionsFromSystemAlerts(true)
        }
    }
    #endif
    
