Volume slider changes global instead of local volume (player demo)

Fixes goldfire#636

Author: goldfire

examples/player/player.js

@@ -181,11 +181,8 @@ Player.prototype = {
   volume: function(val) {
     var self = this;
 
-    // Get the Howl we want to manipulate.
-    var sound = self.playlist[self.index].howl;
-
-    // Update the volume to the new value.
-    sound.volume(val);
+    // Update the global volume (affecting all Howls).
+    Howler.volume(val);
 
     // Update the display on the slider.
     var barWidth = (val * 90) / 100;