diff --git a/ISound.js b/ISound.js
index 3dfd2ac..895af1f 100644
--- a/ISound.js
+++ b/ISound.js
@@ -15,14 +15,13 @@ function ISound() {
 
 	// the following properties are public but should NOT be assigned directly.
 	// instead, use the setter functions: setId, setVolume, setPan, setLoop, setPitch.
-	this.id              = 0;
+	this.id              = null;
 	this.volume          = 1.0;
 	this.pan             = 0.0;
 	this.loop            = false;
 	this.pitch           = 0.0;
 
 	// private properties
-	this._src            = '';
 	this._loaded         = false;
 	this._loading        = false;
 	this._unloading      = false;
@@ -38,9 +37,7 @@ ISound.prototype.init = function () { /* virtual function */ };
 
 //▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
 ISound.prototype.setId = function (value) {
-	var audioPath = this.audioManager.settings.audioPath;
 	this.id      = value;
-	this._src    = audioPath + value + '.mp3';
 	this._loaded = false;
 };
 
@@ -67,11 +64,9 @@ ISound.prototype.setPitch = function (pitch) {
 //▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
 /** Load sound. Abstract method to be overwritten
  * @private
- *
- * @param {String} filePath - audio file to be loaded
  */
-ISound.prototype._load = function (filePath) {
-	console.log('ISound load call: ' + filePath);
+ISound.prototype._load = function () {
+	console.log('ISound load call: ' + this.id);
 	return this._finalizeLoad(null);
 };
 
@@ -88,8 +83,7 @@ ISound.prototype.load = function (cb) {
 	if (this._loading) return;
 	this._loading = true;
 
-	var filePath = this.audioManager.settings.assetSeverUrl + this._src;
-	return this._load(filePath, this);
+	return this._load();
 };
 
 //▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
@@ -137,8 +131,7 @@ ISound.prototype.unload = function () {
 	this.audioManager.usedMemory -= this.usedMemory;
 	this.setVolume(1.0);
 	this.setPan(0.0);
-	this.id         = 0;
-	this._src       = '';
+	this.id         = null;
 	this._loaded    = false;
 	this.usedMemory = 0;
 
@@ -176,7 +169,7 @@ ISound.prototype.play = function (vol, pan, pitch) {
 /** Play sound. Abstract method to be overwritten */
 ISound.prototype._play = function () {
 	this.playing = true;
-	console.log('ISound play call: "' + this._src + '"');
+	console.log('ISound play call: "' + this.id + '"');
 };
 
 //▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
diff --git a/README.md b/README.md
index b0e3757..3c5bdd5 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,6 @@
 Play sounds using Web Audio, fallback on HTML5 Audio.
 `AudioManager` is specifically designed to works for games that have a big
 quantity of audio assets. Loading and unloading is made easy and transparent.
-If available, WizAsset is used for downloading files to disc.
 
 # API
 
@@ -151,3 +150,41 @@ audioManager.settings.crossFade   = true; // default is false
 ```javascript
 audioManager.release();
 ```
+
+### Custom loader function
+`audioManager.settings.getFileUri` can be overriden if you want more control on how to 
+resolve files uri from sound id. The function have one on the following synchronous or
+asynchronous profile:
+
+```javascript
+function getFileUriSync(audioPath, id) {
+	var uri;
+	// ...
+	return uri;
+}
+```
+
+```javascript
+function getFileUriAsync(audioPath, id, callback) {
+	var uri;
+	var error = null;
+	// ...
+	return callback(error, uri);
+}
+```
+
+For instance, here's how you can add [wizAssets](https://github.com/Wizcorp/phonegap-plugin-wizAssets)
+to cache files on disc in a PhoneGap application:
+```javascript
+if (window.wizAssets) {
+    audioManager.settings.getFileUri = function wizAssetsGetUri(audioPath, id, cb) {
+        window.wizAssets.downloadFile(audioPath + id + '.mp3', 'audio/' + id + '.mp3', 
+            function onSuccess(uri) {
+                cb(null, uri)
+            }, 
+            cb // onFail callback
+        );
+    }
+}
+```
+
diff --git a/Sound.js b/Sound.js
index 2702d92..1189bfc 100644
--- a/Sound.js
+++ b/Sound.js
@@ -39,15 +39,13 @@ Sound.prototype.setLoop = function (value) {
 //▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
 /** Load sound
  * @private
- *
- * @param {String} filePath - audio file to be loaded
  */
-Sound.prototype._load = function (filePath) {
+Sound.prototype._load = function () {
 	var self = this;
 
-	function loadFail() {
+	function loadFail(error) {
 		// TODO: keep track that loading has failed to not retry to loading it
-		self._finalizeLoad('Sound could not be loaded.');
+		self._finalizeLoad(error);
 	}
 
 	function onAudioLoaded() {
@@ -58,10 +56,10 @@ Sound.prototype._load = function (filePath) {
 		self._finalizeLoad(null);
 	}
 
-	function onAudioError() {
+	function onAudioError(error) {
 		this.removeEventListener('canplaythrough', onAudioLoaded);
 		this.removeEventListener('error', onAudioError);
-		loadFail();
+		loadFail(error);
 	}
 
 	function loadAudio(uri) {
@@ -72,10 +70,24 @@ Sound.prototype._load = function (filePath) {
 		self._audio.load();
 	}
 
-	if (window.wizAssets) {
-		window.wizAssets.downloadFile(filePath, this._src, loadAudio, loadFail);
+	var getFileUri = this.audioManager.settings.getFileUri;
+	var audioPath  = this.audioManager.settings.audioPath;
+
+	if (getFileUri.length > 2) {
+		// asynchronous
+		getFileUri(audioPath, this.id, function onUri(error, uri) {
+			if (error) return loadFail(error);
+			loadAudio(uri);
+		});
 	} else {
-		loadAudio(filePath);
+		// synchronous
+		try {
+			var uri = getFileUri(audioPath, this.id);
+			if (!uri) return loadFail('emptyUri');
+			loadAudio(uri);
+		} catch (error) {
+			loadFail(error);
+		}
 	}
 };
 
diff --git a/SoundBuffered.js b/SoundBuffered.js
index 02a6a2e..8d50533 100644
--- a/SoundBuffered.js
+++ b/SoundBuffered.js
@@ -156,17 +156,15 @@ SoundBuffered.prototype._setPlaybackRate = function (portamento) {
 //▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
 /** Load sound
  * @private
- *
- * @param {String} filePath - audio file to be loaded
  */
-SoundBuffered.prototype._load = function (filePath) {
+SoundBuffered.prototype._load = function () {
 	var self = this;
 
 	this._createAudioNodes();
 
-	function loadFail() {
+	function loadFail(error) {
 		// TODO: keep track that loading has failed so we don't retry to load it ?
-		self._finalizeLoad('Sound could not be loaded.');
+		self._finalizeLoad(error);
 	}
 
 	function onAudioLoaded(buffer) {
@@ -183,7 +181,7 @@ SoundBuffered.prototype._load = function (filePath) {
 		xobj.onreadystatechange = function onXhrStateChange() {
 			if (~~xobj.readyState !== 4) return;
 			if (~~xobj.status !== 200 && ~~xobj.status !== 0) {
-				return loadFail();
+				return loadFail('xhrError:' + xobj.status);
 			}
 			if (self.audioContext) {
 				self.audioContext.decodeAudioData(xobj.response, onAudioLoaded, loadFail);
@@ -192,14 +190,29 @@ SoundBuffered.prototype._load = function (filePath) {
 				self._finalizeLoad(null);
 			}
 		};
+
 		xobj.open('GET', uri, true);
 		xobj.send();
 	}
 
-	if (window.wizAssets) {
-		window.wizAssets.downloadFile(filePath, this._src, loadAudio, loadFail);
+	var getFileUri = this.audioManager.settings.getFileUri;
+	var audioPath  = this.audioManager.settings.audioPath;
+
+	if (getFileUri.length > 2) {
+		// asynchronous
+		getFileUri(audioPath, this.id, function onUri(error, uri) {
+			if (error) return loadFail(error);
+			loadAudio(uri);
+		});
 	} else {
-		loadAudio(filePath);
+		// synchronous
+		try {
+			var uri = getFileUri(audioPath, this.id);
+			if (!uri) return loadFail('emptyUri');
+			loadAudio(uri);
+		} catch (error) {
+			loadFail(error);
+		}
 	}
 };
 
@@ -233,8 +246,8 @@ SoundBuffered.prototype._play = function (pitch) {
 	}
 
 	// prevent a looped sound to play twice
+	// TODO: add a flag to allow force restart
 	if (this.loop && this.playing) {
-		// TODO: restart sound from beginning
 		// update pitch if needed
 		if ((pitch || pitch === 0) && pitch !== this._playPitch) {
 			this._playPitch = pitch;
@@ -243,15 +256,19 @@ SoundBuffered.prototype._play = function (pitch) {
 		return;
 	}
 
-	// if sound is still fading out, we stop and clear it before restarting it
+	this.playing = true;
+	this.gain.setTargetAtTime(this.volume, this.audioContext.currentTime, this.fade);
+
+	// if sound is still fading out, clear all onStop callback
 	if (this._fadeTimeout) {
 		this._onStopCallback = null;
-		this._stopAndClear();
+		this.stopping = false;
+		this.source.onended = null;
+		window.clearTimeout(this._fadeTimeout);
+		this._fadeTimeout = null;
+		return;
 	}
 
-	this.playing = true;
-	this.gain.setTargetAtTime(this.volume, this.audioContext.currentTime, this.fade);
-
 	var sourceNode = this.source = this.audioContext.createBufferSource();
 	sourceNode.connect(this.sourceConnector);
 
diff --git a/component.json b/component.json
index 220060d..94fb5ba 100644
--- a/component.json
+++ b/component.json
@@ -1,7 +1,7 @@
 {
 	"name": "AudioManager",
 	"repo": "Wizcorp/AudioManager",
-	"version": "0.1.5",
+	"version": "0.1.6",
 	"description": "Play sounds using Web Audio, fallback to HTML5 Audio",
 	"dependencies": {
 		"Wizcorp/util": "0.1.0"
diff --git a/index.js b/index.js
index 2684e68..7564b87 100644
--- a/index.js
+++ b/index.js
@@ -44,13 +44,13 @@ function AudioManager(channels) {
 	// settings
 	this.settings = {
 		audioPath:      '',   // path to audio assets folder
-		assetSeverUrl:  '',   // asset server url
 		maxSoundGroup:  500,
 		maxUsedMemory:  300,  // seconds
 		defaultFade:    2,    // seconds
 		maxPlayLatency: 1000, // milliseconds
 		fadeOutRatio:   0.4,
-		crossFading:    false
+		crossFading:    false,
+		getFileUri:     function getFileUri(audioPath, id) { return audioPath + id + '.mp3'; }
 	};
 
 	// create channels
@@ -268,8 +268,8 @@ AudioManager.prototype.playLoopSound = function (channelId, soundId, volume, pan
 	var defaultFade    = this.settings.defaultFade;
 	var crossFading    = this.settings.crossFading;
 	var channel        = this.channels[channelId];
-	var currentSoundId = channel.loopId;
 	var currentSound   = channel.loopSound;
+	var currentSoundId = currentSound && currentSound.id;
 
 	volume = Math.max(0, Math.min(1, volume || 1));
 
@@ -280,7 +280,7 @@ AudioManager.prototype.playLoopSound = function (channelId, soundId, volume, pan
 	if (channel.muted) return;
 
 	// if requested sound is already playing, update volume, pan and pitch
-	if (soundId === currentSoundId && currentSound && currentSound.playing) {
+	if (soundId === currentSoundId && currentSound && (currentSound.playing || currentSound.stopping)) {
 		currentSound.play(volume * channel.volume, pan, pitch);
 		if (channel.nextLoop) {
 			channel.nextLoop.cancelOnLoadCallbacks();
diff --git a/package.json b/package.json
index 5fa238d..ea711e7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "audio-manager",
-  "version": "0.1.5",
+  "version": "0.1.6",
   "description": "Play sounds using Web Audio, fallback to HTML5 Audio",
   "main": "index.js",
   "scripts": {