             let audioFile = self.audioFile,
             let floatChannelData = buffer.floatChannelData,
             let fadedBuffer = AVAudioPCMBuffer(pcmFormat: buffer.format, frameCapacity: buffer.frameCapacity) else {
-            return
+                return
         }
         let length: AVAudioFrameCount = buffer.frameLength
 

        // since the edit points would be reversed as well, we swap them here:
        if isReversed {
            let revEndTime = duration - startTime
            let revStartTime = endTime > 0 ? duration - endTime : duration

            startFrame = AVAudioFramePosition(revStartTime * fileFormat.sampleRate)
            endFrame = AVAudioFramePosition(revEndTime * fileFormat.sampleRate)

    // this will be the method in the scheduling completionHandler >= 10.13
    @available(iOS 11, macOS 10.13, tvOS 11, *)
    @objc private func handleCallbackComplete(completionType: AVAudioPlayerNodeCompletionCallbackType) {
        // AKLog("\(audioFile?.url.lastPathComponent ?? "Error") currentFrame:\(currentFrame) totalFrames:\(frameCount)")
        // only forward the completion if is actually done playing.
        // if the user calls stop() themselves then the currentFrame will be < frameCount

