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diff --git a/arts/tools/levelmeters.h b/arts/tools/levelmeters.h
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+    /*
+
+    Copyright (C) 2000 Hans Meine
+	                   <hans_meine@gmx.net>
+
+    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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+    */
+
+#ifndef ARTS_TOOLS_LEVELMETERS_H
+#define ARTS_TOOLS_LEVELMETERS_H
+
+#include <qobject.h>
+#include <qframe.h>
+#include <qdatetime.h>
+#include <qptrlist.h>
+#include <math.h>
+
+// helper functions
+const float LEVEL_MIN= 1.f/(1<<20); // minimal positive sample for 20 bit resolution
+inline float levelToDB(float level) {
+	if (level<LEVEL_MIN) level=LEVEL_MIN; // prevent from div by 0
+	return (6.f/log(2.f))*log(level);
+}
+
+inline float DBToLevel(float db) {
+	return exp(db/(log(2.f)/6.f));
+}
+
+/**
+ * Base class for a single volume / value bar.
+ */
+class ACLevelMeter : public QFrame {
+	Q_OBJECT
+public:
+	ACLevelMeter(QWidget *parent): QFrame(parent) {}
+public slots:
+	virtual void setValue(float f) = 0;
+};
+
+/**
+ * Base class for a pair of volume / value bars.
+ */
+class StereoLevelMeter : public QFrame {
+	Q_OBJECT
+public:
+	StereoLevelMeter(QWidget *parent): QFrame(parent) {}
+public slots:
+	virtual void setValues(float left, float right) = 0;
+};
+
+/**
+ * Special LevelMeter which remembers min and max of the last [peakMillis]
+ * milliseconds and displays a full bar with optional max/min markers.
+ */
+class PeakBar : public ACLevelMeter {
+	Q_OBJECT
+	bool clipped;
+
+protected:
+	static const int peakMillis; // how long do the peaks stay at their max?
+	
+	class Observation {
+	public:
+		QTime time;
+		float value;
+		Observation(float aValue): value(aValue) { time.start(); }
+	};
+	QPtrList<Observation> lastValues;
+	
+	float currentValue, maxValue, minValue;
+	void checkMinMax();
+
+	bool displayMinPeak;
+	bool horizontalMode;
+
+	void frameChanged();
+	
+public:
+	PeakBar(QWidget *parent);
+	
+	QSize sizeHint() const;
+
+	void drawContents(QPainter *p);
+	virtual void setValue(float f);
+};
+
+/**
+ * Special class which draws the Db scale with ticks, numbers and so on.
+ */
+class ScaleView : public QFrame {
+	Q_OBJECT
+protected:
+	QFont font;
+	int dbRange;
+	int upperMargin, lowerMargin;
+public:
+	ScaleView(QWidget *parent);
+	void setDbRange(int db);
+	void setScaleMargins(int margins) { upperMargin= margins; lowerMargin=margins; }
+	QSize sizeHint() const;
+	void drawContents(QPainter *p);
+};
+
+/**
+ * Reusable class which displays two volume bars (left/right) with a Db scale
+ * and clip indicators. Supports / will have a context menu with some display
+ * options like Db range, whether minimal values are also shown and others.
+ */
+class PeakLevelMeters : public StereoLevelMeter {
+	Q_OBJECT
+protected:
+	int dbRange;
+	PeakBar left, right;
+	ScaleView scaleView;
+
+public:
+	PeakLevelMeters(QWidget *parent);
+
+public slots:
+	void setValues(float leftVal, float rightVal);
+	void setDbRange(int db);
+};
+
+class KLed;
+
+/**
+ * Simple LevelMeter implementation with 12 KLeds.
+ * Shows them in green/yellow/red combi if not blueState set, in which
+ * case it's all blue. (Original artscontrol widget by stw.)
+ */
+class LedMeter : public ACLevelMeter {
+	Q_OBJECT
+protected:
+	KLed *leds[12];
+
+public:
+	LedMeter(QWidget *parent, bool blueState = false);
+	void setValue(float f);
+};
+
+/**
+ * A simple pair of LedMeters.
+ */
+class StereoLedMeters : public StereoLevelMeter {
+	Q_OBJECT
+protected:
+	LedMeter left, right;
+	
+public:
+	StereoLedMeters(QWidget *parent);
+public slots:
+	void setValues(float left, float right);
+};
+
+#endif /* ARTS_TOOLS_LEVELMETERS_H */