diff --git a/mainwindow.cpp b/mainwindow.cpp
index 41f2b0b..12cfb8f 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -63,11 +63,9 @@ void MainWindow::sendCommand(QString cmd)
 
 void MainWindow::replyFinished(QNetworkReply* reply)
 {
-    QString ans;
-
     if(reply->error() == QNetworkReply::NoError) {
         QByteArray data = reply->readAll();
-        ans = QString(data);
+        mAnswer = QString(data);
     } else {
         qDebug() << reply->url();
         qDebug() << reply->errorString();
@@ -77,7 +75,7 @@ void MainWindow::replyFinished(QNetworkReply* reply)
 
     // check power state
     QRegularExpression regexPower("<Power_Control><Power>(.+)</Power></Power_Control>");
-    QRegularExpressionMatch matchPower = regexPower.match(ans);
+    QRegularExpressionMatch matchPower = regexPower.match(mAnswer);
     if (matchPower.hasMatch()) {
         if (matchPower.captured(1) == "On") mPowered = true;
         else if (matchPower.captured(1) == "Off") mPowered = false;
@@ -85,14 +83,14 @@ void MainWindow::replyFinished(QNetworkReply* reply)
 
     // check volume
     QRegularExpression regexVolume("<Volume><Lvl><Val>(.+)</Val>");
-    QRegularExpressionMatch matchVolume = regexVolume.match(ans);
+    QRegularExpressionMatch matchVolume = regexVolume.match(mAnswer);
     if (matchVolume.hasMatch()) {
         mVolume = matchVolume.captured(1).toInt();
     }
 
     // check input
     QRegularExpression regexInput("<Input><Input_Sel>(.+)</Input_Sel>");
-    QRegularExpressionMatch matchInput = regexInput.match(ans);
+    QRegularExpressionMatch matchInput = regexInput.match(mAnswer);
     if (matchInput.hasMatch())
         mInput = matchInput.captured(1);
 
@@ -225,7 +223,6 @@ void MainWindow::on_btn_spotify_clicked()
 
 void MainWindow::on_btn_airplay_clicked()
 {
-    // TODO
     sendCommand("<YAMAHA_AV cmd=\"PUT\"><Main_Zone><Input><Input_Sel>IPOD</Input_Sel></Input></Main_Zone></YAMAHA_AV>");
     mInput = "IPOD";
 }
diff --git a/mainwindow.h b/mainwindow.h
index 3cb7d5b..a6c87f7 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -45,13 +45,14 @@ private:
     const int TIME_VOL_COLLECT = 400;
     const int TIME_UPDATE_STATE = 10000;
     const int TIME_UPDATE_ADDRESS = 1000;
-    
+
     QString mAddress;
     QTimer mTimerValCollect;
     QTimer mTimerUpdateState;
     QTimer mTimerUpdateAddress;
     QSettings* mSettings = nullptr;
     QNetworkAccessManager *mNetworkManager = nullptr;
+    QString mAnswer;
 
     void sendCommand(QString cmd);
     void updateUi();