How to update live NSSlider value?

Question

I have slider with volume value. I need changed volume in live. Whats wrong in my code?

@IBOutlet weak var volumeSliderCurr: NSSlider!

@IBAction func volumeSlider(sender: AnyObject) {
    var event: NSEvent = NSApplication.sharedApplication().currentEvent!
    mouseUp(event)
}

override func mouseUp(theEvent: NSEvent) {
    super.mouseUp(theEvent)
    audioPlayer.volume = volumeSliderCurr.floatValue
    currVolume = volumeSliderCurr.floatValue
}

Answer 1

If you set Continuous in the properties of Interface Builder you get permanent updates of the slider value: