diff --git a/demos/audio/widget.cpp b/demos/audio/widget.cpp
index 1836ddc..8d5a6f6 100644
--- a/demos/audio/widget.cpp
+++ b/demos/audio/widget.cpp
@@ -23,11 +23,12 @@ Widget::Widget(QWidget *parent)
     m_series = new QLineSeries;
     m_chart->addSeries(m_series);
     QValueAxis *axisX = new QValueAxis;
-    axisX->setRange(0, 8000);
+    axisX->setRange(0, 4000);
     QValueAxis *axisY = new QValueAxis;
     axisY->setRange(0, 256);
     m_chart->setAxisX(axisX, m_series);
     m_chart->setAxisY(axisY, m_series);
+    m_chart->legend()->hide();
     m_chart->setTitle("Data from microphone");
 
     QVBoxLayout *mainLayout = new QVBoxLayout;
@@ -48,7 +49,6 @@ Widget::Widget(QWidget *parent)
     m_device = new XYSeriesIODevice(m_series, this);
     m_device->open(QIODevice::WriteOnly);
 
-    m_audioInput->setBufferSize(10);
     m_audioInput->start(m_device);
 }
 
diff --git a/demos/audio/xyseriesiodevice.cpp b/demos/audio/xyseriesiodevice.cpp
index e3bea15..a833d4a 100644
--- a/demos/audio/xyseriesiodevice.cpp
+++ b/demos/audio/xyseriesiodevice.cpp
@@ -16,20 +16,20 @@ qint64 XYSeriesIODevice::readData(char * data, qint64 maxSize)
 
 qint64 XYSeriesIODevice::writeData(const char * data, qint64 maxSize)
 {
-    qint64 range = 8000;
+    qint64 range = 4000;
     QList<QPointF> oldPoints = m_series->points();
     QList<QPointF> points;
 
     if (oldPoints.count() < range) {
         points = m_series->points();
     } else {
-        for (int i = maxSize; i < oldPoints.count(); i++)
-            points.append(QPointF(i - maxSize, oldPoints.at(i).y()));
+        for (int i = maxSize/2; i < oldPoints.count(); i++)
+            points.append(QPointF(i - maxSize/2, oldPoints.at(i).y()));
     }
 
     qint64 size = points.count();
-    for (int k = 0; k < maxSize; k++)
-        points.append(QPointF(k + size, (quint8)data[k]));
+    for (int k = 0; k < maxSize/2; k++)
+        points.append(QPointF(k + size, (quint8)data[2 * k]));
 
     m_series->replace(points);
     return maxSize;