A Dalek-like audio effect

dalekTalk.swift

#!/usr/bin/env xcrun swift
// $ chmod +x dalekTalk.swift
// $ ./dalekTalk.swift

// Based upon https://gist.github.com/okket/e461e85ea8b414863648

import Cocoa
import AVFoundation
import Foundation

if #available(iOS 9, OSX 10.10, *) {
    // Setup engine and node instances
    var engine = AVAudioEngine()
    var mixer = engine.mainMixerNode
    var input = engine.inputNode
    var format = input!.inputFormat(forBus: 0)
    
    // Attach FX nodes to engine
    
    var reverb = AVAudioUnitReverb()
    reverb.loadFactoryPreset(AVAudioUnitReverbPreset.plate)
    reverb.wetDryMix = 50
    engine.attach(reverb)
    
    var distortion = AVAudioUnitDistortion()
    distortion.loadFactoryPreset(AVAudioUnitDistortionPreset.speechCosmicInterference)
    distortion.wetDryMix = 85
    engine.attach(distortion)
    
    // Connect nodes
    engine.connect(input!, to: reverb, format: format)
    engine.connect(reverb, to: distortion, format: format)
    engine.connect(distortion, to: mixer, format: format)
    
    // Start engine
    do {
        try engine.start()
        
        print("\nShout like a Dalek")
        print("Make sure to use Headphones")
        print("\nHit <ENTER> when you get bored")
        var output: CInt = 0
        var c = getchar()
        print("Exterminated!")
    }
    catch {
        print("oh no!")
    }
}