#57 - 取元件變動值

取slide bar “gain“ 的元件值

@IBAction func gain(sender: UISlider) {
	var val = sender.value //這邊sender就是slide bar元件
	println(String(format: "gain %f", val))
	var filterParams = EQNode.bands[0] as AVAudioUnitEQFilterParameters
	// filterParams.gain = val
	EQNode.globalGain = val
	}