Problems playing multiple sounds with TheAmazingAudioEngine - ios

Question

I'm implementing a low-latency drum set with TheAmazingAudioEngine framework. I have a scene with a single button and a viewController with the methods below. This code works very well if I touch the button slowly. But if I touch it many times in a short period of time --- 10 times per second, for instance ---, the sound is not played in some touches, without error messages. The audio sample is short (less than 2 seconds).
Why does it happen? What is wrong in my implementation?
I choose TheAmazingAudioEngine instead of AVAudioPlayer to get low-latency between the touch and the sound.
override func viewDidLoad() {
super.viewDidLoad()
// Enable multiple touch for the button
for v in view.subviews {
if v.isKindOfClass(UIButton) {
v.multipleTouchEnabled = true
}
}
// Init audio
audioController = AEAudioController(audioDescription: AEAudioController.nonInterleavedFloatStereoAudioDescription())
audioURL = NSBundle.mainBundle().URLForResource("shortSound", withExtension: "wav")!
do {
try audioController?.start()
} catch {
print("AudioController start Error")
}
}
override func viewDidDisappear(animated: Bool) {
super.viewDidDisappear(animated)
audioController?.stop()
}
#IBAction func playSound(sender: UIButton) {
do {
let player = try AEAudioFilePlayer(URL: audioURL)
player.removeUponFinish = true
audioController?.addChannels([player])
} catch {
print("Player start Error")
}
}