How to observe AVKit (AVPlayer) player rate >= 2.0?

Question #1 How do you determine what the player rate is, after command-clicking the fast-forward control?

Question #2 Is there something that needs to be done to keep the audio when manually adjusting the playback rate for 2.0+

Property observing appears to work only for rates below 2.0

Background I am using custom controls (slider and stepper) that are available for the user to manage the speed of playback and keeping both in sync. I am keeping them in sync by obtaining the player rate, using a property observer. Changing the custom control adjusts the play rate and changing the AVKit provided controls changes the custom controls. This works as expected until I command-click the fast-forward control. The property observer reports a play rate of 0, which should mean it is stopped but it is clearly moving forward at a high rate. If I programmatically change the play rate (example, player.rate = 5.0) , the property observer report the rate correctly.

Manual method If you option-click the forward fast-forward control, it increments by 0.1 from 1.0 to 2.0x (1.1, 1.2, 1.3, etc.) and the play rate changes accordingly (property observer reports these values) If you command-click the fast-forward control the play rate changes to 2, 5, 10, 30 and 60x. (Property observer reports 0.0)

How do you determine what the player rate is, after command-clicking the fast-forward control?

The other think is that if I programmatically or manually change the player rate in the range up to 1.9x, the audio continues to play. If I programmatically change the player rate from 2.0x+, the audio continues to play If I manually change the rate (command-click the player fast-forward control) the audio does not continue

Is there something that needs to be done to keep the audio when manually adjusting the playback rate for 2.0+

![]("https://developer.apple.com/forums/content/attachment/e915f567-b721-4430-9c61-2789a9058002" "title=PlayerControl.png;width=627;height=183")

    var playRateSync: Double = 1.0 {
        didSet{
            // move in specific increment value
            let increment     = 0.1
            let oldValue      = playRateSync
            let playRateSync  = increment * round(oldValue / increment)
            let playRateStr   = String(format: "%.2f", playRateSync)
            playbackLabel.stringValue   = "Playback Rate: \(playRateStr)"
            playbackSlider.doubleValue  = playRateSync
            playbackStepper.doubleValue = playRateSync
        }
    }


    func setPlayRateObserver(player: AVPlayer)
    {
        player.addObserver(self, forKeyPath: "rate", options: [.new, .old, .initial], context: nil)
    }

    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        print("keyPath: \(keyPath), object: \(object), change: \(change)")
        if object as AnyObject? === playerView.player {
            if keyPath == "rate" {
                print("The real rate: \(Double(playerView.player!.rate))")
                if let player = playerView.player
                {
                    if player.rate > 0 {
                        playRateSync = Double(player.rate)
                        print("Rate changed.  New Rate: \(player.rate)")
                    }
                }
            }
        }
    }