Added: Analysis panel which shows the calculated frequency response of the filters for the selected device and channel.

Improved: GUIs of GraphicEQ and Copy command can now be resized
Improved: GraphicEQ GUI can now be zoomed separately in X and Y direction using mouse wheel on rulers. Also now shows values at mouse position.
Fixed: Original APO was not released when E-APO was shutting down, leading to a memory leak.

Editor/widgets/ExponentialSpinBox.cpp

@@ -0,0 +1,55 @@
+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2015  Jonas Thedering
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License along
+	with this program; if not, write to the Free Software Foundation, Inc.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include <cmath>
+#include "ExponentialSpinBox.h"
+
+using namespace std;
+
+ExponentialSpinBox::ExponentialSpinBox(QWidget* parent)
+	: QSpinBox(parent)
+{
+
+}
+
+void ExponentialSpinBox::stepBy(int steps)
+{
+	qint64 v = value();
+	if(steps > 0)
+	{
+		v <<= steps;
+		if(v > maximum())
+			v = maximum();
+	}
+	else
+	{
+		v >>= -steps;
+		if(v < minimum())
+			v = minimum();
+	}
+
+	setValue((int)v);
+}
+
+int ExponentialSpinBox::valueFromText(const QString& text) const
+{
+	int value = QSpinBox::valueFromText(text);
+	value = exp2(round(log2(value)));
+	return value;
+}