diff --git a/gtk2_ardour/varispeed_dialog.cc b/gtk2_ardour/varispeed_dialog.cc
index e1f692afb6..ba0dbf20a2 100644
--- a/gtk2_ardour/varispeed_dialog.cc
+++ b/gtk2_ardour/varispeed_dialog.cc
@@ -18,6 +18,8 @@
 
 #include <ardour/session.h>
 
+#include "pbd/unwind.h"
+
 #include "varispeed_dialog.h"
 
 #include "ardour_ui.h"
@@ -31,10 +33,13 @@ VarispeedDialog::VarispeedDialog ()
 	: ArdourDialog (_("Varispeed"), false)
 	, _semitones_adjustment (0.0, -12.0, 12.0, 1.0, 4.0)
 	, _cents_adjustment (0.0, -100.0, 100.0, 1.0, 10.0)
+	, _percent_adjustment (100.0, -50.0, 200.0, 1.0, 10.0)
 	, _semitones_spinner (_semitones_adjustment)
 	, _cents_spinner (_cents_adjustment)
+	, _percent_spinner (_percent_adjustment)
+	, ignore_changes (false)
 {
-	Table* t = manage (new Table (3, 2));
+	Table* t = manage (new Table (5, 2));
 	t->set_row_spacings (6);
 	t->set_col_spacings (6);
 
@@ -49,14 +54,21 @@ VarispeedDialog::VarispeedDialog ()
 	t->attach (_cents_spinner, 1, 2, r, r + 1, FILL, EXPAND & FILL, 0, 0);
 	++r;
 
+	l = manage (new Label (_("Percentage:"), ALIGN_START, ALIGN_CENTER, false));
+	t->attach (*l, 0, 1, r, r + 1, FILL, EXPAND, 0, 0);
+	t->attach (_percent_spinner, 1, 2, r, r + 1, FILL, EXPAND & FILL, 0, 0);
+	++r;
+
 	get_vbox ()->set_spacing (6);
 	get_vbox ()->pack_start (*t, false, false);
 
 	_semitones_spinner.set_can_focus (false);
 	_cents_spinner.set_can_focus (false);
+	_percent_spinner.set_can_focus (false);
 
-	_semitones_spinner.signal_changed ().connect (sigc::mem_fun (*this, &VarispeedDialog::apply_speed));
-	_cents_spinner.signal_changed ().connect (sigc::mem_fun (*this, &VarispeedDialog::apply_speed));
+	_semitones_spinner.signal_changed ().connect (sigc::mem_fun (*this, &VarispeedDialog::apply_semitones));
+	_cents_spinner.signal_changed ().connect (sigc::mem_fun (*this, &VarispeedDialog::apply_semitones));
+	_percent_spinner.signal_changed ().connect (sigc::mem_fun (*this, &VarispeedDialog::apply_percentage));
 
 	show_all_children ();
 }
@@ -79,12 +91,42 @@ VarispeedDialog::adj_semi (double delta)
 }
 
 void
-VarispeedDialog::apply_speed ()
+VarispeedDialog::apply_semitones ()
 {
-	int cents = _semitones_spinner.get_value () * 100 + _cents_spinner.get_value ();
+	if (ignore_changes) {
+		return;
+	}
 
+	int cents = _semitones_spinner.get_value () * 100 + _cents_spinner.get_value ();
 	double speed = pow (2.0, ((double)cents / 1200.0));
 
+	{
+		PBD::Unwinder<bool> uw (ignore_changes, true);
+		_percent_adjustment.set_value (100. * pow (2.0, (cents/1200.0)));
+	}
+
+	if (_session && _session->default_play_speed () != speed) {
+		_session->request_default_play_speed (speed);
+	}
+}
+
+void
+VarispeedDialog::apply_percentage ()
+{
+	if (ignore_changes) {
+		return;
+	}
+
+	double speed = 1.0 + (_percent_spinner.get_value() / 100.0);
+
+	{
+		PBD::Unwinder<bool> uw (ignore_changes, true);
+		double absspeed = ::abs (speed);
+		double semitones = 12. * (log (absspeed - 1.0) / log(2.));
+		_semitones_adjustment.set_value (floor (semitones));
+		_cents_adjustment.set_value (100. * fmod (semitones, 1.));
+	}
+
 	if (_session && _session->default_play_speed () != speed) {
 		_session->request_default_play_speed (speed);
 	}
@@ -93,7 +135,7 @@ VarispeedDialog::apply_speed ()
 void
 VarispeedDialog::on_show ()
 {
-	apply_speed ();
+	apply_semitones ();
 	ArdourDialog::on_show ();
 	set_position (Gtk::WIN_POS_NONE); // remember position from now on
 }
diff --git a/gtk2_ardour/varispeed_dialog.h b/gtk2_ardour/varispeed_dialog.h
index 094075030f..e6c0b08854 100644
--- a/gtk2_ardour/varispeed_dialog.h
+++ b/gtk2_ardour/varispeed_dialog.h
@@ -34,7 +34,8 @@ public:
 	void adj_semi (double delta);
 
 private:
-	void apply_speed ();
+	void apply_semitones ();
+	void apply_percentage ();
 
 	void on_show ();
 	void on_hide ();
@@ -42,8 +43,12 @@ private:
 
 	Gtk::Adjustment _semitones_adjustment;
 	Gtk::Adjustment _cents_adjustment;
+	Gtk::Adjustment _percent_adjustment;
 	Gtk::SpinButton _semitones_spinner;
 	Gtk::SpinButton _cents_spinner;
+	Gtk::SpinButton _percent_spinner;
+
+	bool ignore_changes;
 };
 
 #endif