table cellでは一つのボタンで再生と停止というのはできないのでしょうか？

セルごとに異なる曲を再生したく、プロジェクトに４曲（sound01〜sound04)を保存して、以下のコードを書きました。
そして『Play』ボタンを押すと再生して『Pause』と表示され、『Pause』を押すとボタンが『Play』に変わるようにしたいのですが、以下のエラーが出ます。

エラー内容①：
The btnPlayPause outlet from the SecondViewController to the UIButton is invalid. Outlets cannot be connected to repeating content.

エラー内容②：
Use of unresolved identifier 'audioPath'

//ViewControllerのコード
import UIKit
import AVFoundation

class SecondViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, CustomTableViewCellDelegate  {
       
    var player = AVAudioPlayer()
 
    let imageNames = ["futako.jpg", "yokado.jpg", "fran.jpg", "zikken.jpg"]
    
    let imageTitles = ["イヌ２", "ネコ2", "イヌ1", "イヌ2"]
    var audioPlayer = AVAudioPlayer()
    
    let imageDescriptions = [
        "イヌ",
        "ネコ",
        "イヌ",
        "イヌ"
    ]
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    
    
        player = AVAudioPlayer(contentsOfURL: audioPath, error: nil)
        player.prepareToPlay()
    
    
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    
    @IBOutlet weak var btnPlayPause: UIButton!
    
    @IBAction func btnPlayPause(sender: UIButton) {
        
        if (player.playing) {
            player.pause()
            btnPlayPause.setTitle("Play", forState: UIControlState.Normal)
        } else {
            player.play()
            btnPlayPause.setTitle("Pause", forState: UIControlState.Normal)
        }
    } 
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return imageNames.count
    }
    
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        
        let cell = tableView.dequeueReusableCellWithIdentifier("MyCell1") as! CustomTableViewCell1
        
        cell.setCell(imageNames[indexPath.row], titleText: imageTitles[indexPath.row], descriptionText: imageDescriptions[indexPath.row])
        cell.index = indexPath
        cell.delegate = self
        
        return cell
    }
    
    func selectCellButton(index: NSIndexPath) {
        let fileName = "sound\(index.row + 1)"
        
        print(fileName)
        
        do {
            let filePath = NSBundle.mainBundle().pathForResource(fileName, ofType: "mp3")
            let audioPath = NSURL(fileURLWithPath: filePath!)
            audioPlayer = try AVAudioPlayer(contentsOfURL: audioPath)
            if audioPlayer.prepareToPlay() {
                audioPlayer.play()
            }
        } catch {
            print("Error")
        }
    }    
}
    
   

//CustomTableViewCellのコード

import UIKit

protocol CustomTableViewCellDelegate: class {
    func selectCellButton(index: NSIndexPath)
}

class CustomTableViewCell1: UITableViewCell {


    @IBOutlet weak var myImageView: UIImageView!
    @IBOutlet weak var myTitleLabel: UILabel!
    @IBOutlet weak var myDescriptionLabel: UILabel!
    
    @IBOutlet weak var btnPlayPause: UIButton!
    
    
    weak var delegate: CustomTableViewCellDelegate!
    var index: NSIndexPath!
    
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }
    
    override func setSelected(selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
        
        // Configure the view for the selected state
    }
    
    func setCell(imageName: String, titleText: String, descriptionText: String) {
        myImageView.image = UIImage(named: imageName)
        myTitleLabel.text = titleText
        myDescriptionLabel.text = descriptionText
    }
}