Sound track plays in simulator but not on my device ??

Hello,

was hoping for some help for a small app I’m practising with ?

I have searched and searched and watched numerous “play sound youtubes” dont seem to be able to crack it ?

The App segues to another view controller and plays the sound track straight after the segue.

This works fine and plays sound in my simulator, but as soon as i try it on my device it segues to the View Controller but no sound plays ? Its as if the volume setting on the device is set to zero although I have checked all i can ? ?

Would love some help please if any suggesions ?

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import UIKit
import AVFoundation

class GoTourViewController: UIViewController, AVAudioPlayerDelegate {

var player: AVAudioPlayer?

@IBOutlet weak var volumeSlider: UISlider!

@IBAction func changeVolume(_ sender: UISlider) {
    player?.setVolume(sender.value, fadeDuration: 0.1)

}

@IBAction func actionButtons(_ sender: UIButton) {

let index = sender.tag
    
    switch index {
    case 0:
        player?.play()
    case 1:
        player?.pause()
    case 2:
        player?.currentTime = 0
        player?.stop()
    default:
        break
}

}

override func viewDidLoad() {
    super.viewDidLoad()

    if let player = player, player.isPlaying {
        // Stop playback
        player.stop()
               
    }
    else {
        // set up player and play
        
        let urlString = Bundle.main.path(forResource: "Track", ofType: "mp3")
        
        do {
            try AVAudioSession.sharedInstance().setMode(.default)
            try AVAudioSession.sharedInstance().setActive(true, options: .notifyOthersOnDeactivation)
        
            guard let urlString = urlString else {
                return
            }
            
            player = try AVAudioPlayer(contentsOf: URL(fileURLWithPath: urlString))
            
            guard let player = player else {
                return
            }
            // player.prepareToPlay()
            print("prepare to play called")
            
            player.play()
            
            //TODO: - On completion of playing audio track on player go back to locationViewController ?
            
        }
        catch {
            print("Something went wrong")
        }
    }
}

}

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