diff --git a/webpack/lib/audio-manager.js b/webpack/lib/audio-manager.js
index e5e56db..d616894 100644
--- a/webpack/lib/audio-manager.js
+++ b/webpack/lib/audio-manager.js
@@ -37,8 +37,10 @@ export default class AudioManager{
 		this._ws = {
 			stack: [],
 			send: function(_data){
-				if( this.ws.readyState !== 1 ) // not connected -> stack
+				if( this.ws.readyState !== 1 ){ // not connected -> stack
+					console.warn(`push stack`);
 					return this._ws.stack.push(_data);
+				}
 
 				console.warn(`send buffer[${_data.length}]`);
 				this.ws.send(_data);
@@ -65,7 +67,8 @@ export default class AudioManager{
 
 			fr.onload = function(){
 				let buf16 = new Int16Array(fr.result);
-				this.receive(buf16).bind(this);
+				this.receive(buf16);
+
 			}.bind(this);
 
 			fr.readAsArrayBuffer(_msg.data);