Home Frequency change event - AudioKit & Swift
 I'm using Swift 4 with the AudioKit Framework 4.0.4. I'd like to track the frequency of the input microphone of my iOS device in real time. Currently I'm using a timer calling the output-function that prints out oscillator.frequency every 0.1 seconds. let timer = Timer.scheduledTimer( timeInterval: 0.1, target: self, selector: #selector(self.output), userInfo: nil, repeats: true) func output() { print("Frequency: \(oscillator.frequency)") }  But is there a way to just listen for the change of the oscillator.frequency struct? Maybe something like an event called every time if the oscillator.frequency was changed.