Using sound effects with AudioEngine

Question

Background - I saw a video titled \"AVAudioEngine in Practice\" from the following list of videos published at Apple\'s recent WWDC to apply sound effects to an audio. https

Answer 1

Background - I saw a video titled "Putting it all together - Intro to iOS App Development with Swift" from the following list of videos published at Udacity to apply sound effects to an audio.

https://youtu.be/XiQfjaYJjuQ

After that, I was successfully able to change the pitch of an audio with the following code:

func playAudioWithVariablePith(pitch: Float){
        audioPlayer.stop()
        audioEngine.stop()
        audioEngine.reset()

        let audioPlayerNode = AVAudioPlayerNode()
        audioEngine.attachNode(audioPlayerNode)

        let changePitchEffect = AVAudioUnitTimePitch()
        changePitchEffect.pitch = pitch

        audioEngine.attachNode(changePitchEffect)

        audioEngine.connect(audioPlayerNode, to: changePitchEffect, format: nil)

        audioEngine.connect(changePitchEffect, to: audioEngine.outputNode, format: nil)

        audioPlayerNode.scheduleFile(audioFile, atTime: nil, completionHandler: nil)

        try! audioEngine.start()

        audioPlayerNode.play()

    }

Answer 2

Just connect them.

engine.connect(playerNode, to: reverbNode, format: format)
engine.connect(reverbNode, to: distortionNode, format: format)
engine.connect(distortionNode, to: delayNode, format: format)
engine.connect(delayNode, to: mixer, format: format)