Added the source code, exampe app, podspec and README.

Classes/Sound.swift

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+//
+//  Sound.swift
+//  SwiftySound
+//
+//  Created by Adam Cichy on 21/02/17.
+//
+//  Copyright (c) 2017 Adam Cichy
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+
+import Foundation
+import AVFoundation
+
+open class Sound {
+
+    public static var playersPerSound: Int = 5 {
+        didSet {
+            Sound.stopAll()
+            Sound.sounds.removeAll()
+        }
+    }
+
+    private static var sounds = [URL: Sound]()
+
+    private static let defaultsKey = "com.moonlightapps.SwiftySound.enabled"
+
+    public static var enabled: Bool = {
+        return !UserDefaults.standard.bool(forKey: defaultsKey)
+        }() { didSet {
+            let value = !enabled
+            UserDefaults.standard.set(value, forKey: defaultsKey)
+            if value {
+                stopAll()
+            }
+        }
+    }
+
+    private let players: [AVAudioPlayer]
+
+    private var counter = 0
+
+    // MARK: - Initialization
+    public init?(url: URL) {
+        var myPlayers: [AVAudioPlayer] = []
+        for _ in 0..<Sound.playersPerSound {
+            if let player = try? AVAudioPlayer(contentsOf: url) {
+                myPlayers.append(player)
+            }
+        }
+        if myPlayers.count == 0 {
+            return nil
+        }
+        players = myPlayers
+        Sound.sounds[url] = self
+    }
+
+    // MARK: - Main play method
+    @discardableResult public func play(numberOfLoops: Int = 0) -> Bool {
+        if !Sound.enabled {
+            return false
+        }
+        let player = players[counter]
+        counter = (counter + 1) % players.count
+        player.numberOfLoops = numberOfLoops
+        return player.play()
+    }
+
+    // MARK: - Stop playing
+    public func stop() {
+        for player in players {
+            player.stop()
+        }
+    }
+
+    // MARK: - Convenience static methods
+    @discardableResult public static func play(file: String, fileExtension: String? = nil, numberOfLoops: Int = 0) -> Bool {
+        if let url = url(for: file, fileExtension: fileExtension) {
+            return play(url: url, numberOfLoops: numberOfLoops)
+        }
+        return false
+    }
+
+    @discardableResult public static func play(url: URL, numberOfLoops: Int = 0) -> Bool {
+        if !Sound.enabled {
+            return false
+        }
+        var sound = sounds[url]
+        if sound == nil {
+            sound = Sound(url: url)
+        }
+        return sound?.play(numberOfLoops: numberOfLoops) ?? false
+    }
+
+    public static func stop(for url: URL) {
+        let sound = sounds[url]
+        sound?.stop()
+    }
+
+    public static func stop(file: String, fileExtension: String? = nil) {
+        if let url = url(for: file, fileExtension: fileExtension) {
+            let sound = sounds[url]
+            sound?.stop()
+        }
+    }
+
+    public static func stopAll() {
+        for sound in sounds.values {
+            sound.stop()
+        }
+    }
+
+    // MARK: - Private helper method
+    private static func url(for file: String, fileExtension: String? = nil) -> URL? {
+        return Bundle.main.url(forResource: file, withExtension: fileExtension)
+    }
+
+}

Example/Podfile

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+platform :ios, '8.0'
+
+target 'SwiftySoundExample' do
+  # Comment the next line if you're not using Swift and don't want to use dynamic frameworks
+  use_frameworks!
+
+  # Pods for SwiftySoundExample
+  pod 'SwiftySound', :path => '..'
+
+end

Example/Podfile.lock

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+PODS:
+  - SwiftySound (0.1.0)
+
+DEPENDENCIES:
+  - SwiftySound (from `..`)
+
+EXTERNAL SOURCES:
+  SwiftySound:
+    :path: ..
+
+SPEC CHECKSUMS:
+  SwiftySound: 4444fba6cf5a1042d48ed002f49ecc643a462539
+
+PODFILE CHECKSUM: 89161fbfac7d858e95250684d3810ab14d4c94c7
+
+COCOAPODS: 1.2.0