diff --git a/Readme.md b/Readme.md
index f5d381d..d386c89 100644
--- a/Readme.md
+++ b/Readme.md
@@ -8,7 +8,7 @@ Code is available under MIT license.
 
 ### Example
 ```html
-<audio id="myAudio" controls src="woscope-music/khrang.mp3"></audio><br>
+<audio id="myAudio" controls src="woscope-music/khrang.m4a"></audio><br>
 <canvas id="myCanvas" width="800" height="800"></canvas>
 <script src="dist/woscope.js"></script>
 <script>
diff --git a/woscope-music b/woscope-music
index 13b4f6a..f98fb51 160000
--- a/woscope-music
+++ b/woscope-music
@@ -1 +1 @@
-Subproject commit 13b4f6af4240abb695b5b11a347e2ab414c2f4f6
+Subproject commit f98fb51b38a11466641121f3dff7e64b70e3f999