diff --git a/gtk2_ardour/gain_meter.cc b/gtk2_ardour/gain_meter.cc
index a92ac67c6f..040ed03ea6 100644
--- a/gtk2_ardour/gain_meter.cc
+++ b/gtk2_ardour/gain_meter.cc
@@ -427,18 +427,22 @@ GainMeterBase::show_gain ()
 void
 GainMeterBase::gain_adjusted ()
 {
+	gain_t value = 0;
+
+	switch (_data_type) {
+	case DataType::AUDIO:
+		value = slider_position_to_gain_with_max (gain_adjustment.get_value(), Config->get_max_gain());
+		break;
+	case DataType::MIDI:
+		value = gain_adjustment.get_value ();
+		break;
+	}
+	
 	if (!ignore_toggle) {
 		if (_route && _route->amp() == _amp) {
-			switch (_data_type) {
-			case DataType::MIDI:
-				_route->set_gain (gain_adjustment.get_value(), this);
-				break;
-			case DataType::AUDIO:
-				_route->set_gain (slider_position_to_gain_with_max (gain_adjustment.get_value(), Config->get_max_gain()), this);
-				break;
-			}
+			_route->set_gain (value, this);
 		} else {
-			_amp->set_gain (slider_position_to_gain_with_max (gain_adjustment.get_value(), Config->get_max_gain()), this);
+			_amp->set_gain (value, this);
 		}
 	}
 
diff --git a/gtk2_ardour/processor_box.cc b/gtk2_ardour/processor_box.cc
index 80b2352788..0cd3008834 100644
--- a/gtk2_ardour/processor_box.cc
+++ b/gtk2_ardour/processor_box.cc
@@ -298,11 +298,12 @@ ProcessorEntry::name () const
 }
 
 SendProcessorEntry::SendProcessorEntry (boost::shared_ptr<Send> s, Width w)
-	: ProcessorEntry (s, w),
-	  _send (s),
-	  _adjustment (gain_to_slider_position_with_max (1.0, Config->get_max_gain()), 0, 1, 0.01, 0.1),
-	  _fader (_slider, &_adjustment, 0, false),
-	  _ignore_gain_change (false)
+	: ProcessorEntry (s, w)
+	, _send (s)
+	, _adjustment (gain_to_slider_position_with_max (1.0, Config->get_max_gain()), 0, 1, 0.01, 0.1)
+	, _fader (_slider, &_adjustment, 0, false)
+	, _ignore_gain_change (false)
+	, _data_type (DataType::AUDIO)
 {
 	_fader.set_name ("SendFader");
 	_fader.set_controllable (_send->amp()->gain_control ());
@@ -311,10 +312,39 @@ SendProcessorEntry::SendProcessorEntry (boost::shared_ptr<Send> s, Width w)
 	_fader.show ();
 
 	_adjustment.signal_value_changed().connect (sigc::mem_fun (*this, &SendProcessorEntry::gain_adjusted));
-	_send->amp()->gain_control()->Changed.connect (send_gain_connection, invalidator (*this), boost::bind (&SendProcessorEntry::show_gain, this), gui_context());
+
+	_send->amp()->gain_control()->Changed.connect (
+		_send_connections, invalidator (*this), boost::bind (&SendProcessorEntry::show_gain, this), gui_context()
+		);
+	
+	_send->amp()->ConfigurationChanged.connect (
+		_send_connections, invalidator (*this), ui_bind (&SendProcessorEntry::setup_gain_adjustment, this), gui_context ()
+		);
+
+	setup_gain_adjustment ();
 	show_gain ();
 }
 
+void
+SendProcessorEntry::setup_gain_adjustment ()
+{
+	if (_send->amp()->output_streams().n_midi() == 0) {
+		_data_type = DataType::AUDIO;
+		_adjustment.set_lower (0);
+		_adjustment.set_upper (1);
+		_adjustment.set_step_increment (0.01);
+		_adjustment.set_page_increment (0.1);
+		_fader.set_default_value (gain_to_slider_position (1));
+	} else {
+		_data_type = DataType::MIDI;
+		_adjustment.set_lower (0);
+		_adjustment.set_upper (2);
+		_adjustment.set_step_increment (0.05);
+		_adjustment.set_page_increment (0.1);
+		_fader.set_default_value (1);
+	}
+}
+
 void
 SendProcessorEntry::setup_slider_pix ()
 {
@@ -325,7 +355,16 @@ SendProcessorEntry::setup_slider_pix ()
 void
 SendProcessorEntry::show_gain ()
 {
-	float const value = gain_to_slider_position_with_max (_send->amp()->gain (), Config->get_max_gain());
+	gain_t value = 0;
+	
+	switch (_data_type) {
+	case DataType::AUDIO:
+		value = gain_to_slider_position_with_max (_send->amp()->gain (), Config->get_max_gain());
+		break;
+	case DataType::MIDI:
+		value = _send->amp()->gain ();
+		break;
+	}
 
 	if (_adjustment.get_value() != value) {
 		_ignore_gain_change = true;
@@ -335,7 +374,11 @@ SendProcessorEntry::show_gain ()
 		stringstream s;
 		s.precision (1);
 		s.setf (ios::fixed, ios::floatfield);
-		s << accurate_coefficient_to_dB (_send->amp()->gain ()) << _("dB");
+		s << accurate_coefficient_to_dB (_send->amp()->gain ());
+		if (_data_type == DataType::AUDIO) {
+			s << _("dB");
+		}
+		
 		_fader.set_tooltip_text (s.str ());
 	}
 }
@@ -347,7 +390,17 @@ SendProcessorEntry::gain_adjusted ()
 		return;
 	}
 
-	_send->amp()->set_gain (slider_position_to_gain_with_max (_adjustment.get_value(), Config->get_max_gain()), this);
+	gain_t value = 0;
+
+	switch (_data_type) {
+	case DataType::AUDIO:
+		value = slider_position_to_gain_with_max (_adjustment.get_value(), Config->get_max_gain());
+		break;
+	case DataType::MIDI:
+		value = _adjustment.get_value ();
+	}
+	
+	_send->amp()->set_gain (value, this);
 }
 
 void
diff --git a/gtk2_ardour/processor_box.h b/gtk2_ardour/processor_box.h
index c595ded4bb..17fb494268 100644
--- a/gtk2_ardour/processor_box.h
+++ b/gtk2_ardour/processor_box.h
@@ -161,12 +161,14 @@ public:
 private:
 	void show_gain ();
 	void gain_adjusted ();
+	void setup_gain_adjustment ();
 
 	boost::shared_ptr<ARDOUR::Send> _send;
 	Gtk::Adjustment _adjustment;
 	Gtkmm2ext::HSliderController _fader;
 	bool _ignore_gain_change;
-	PBD::ScopedConnection send_gain_connection;
+	PBD::ScopedConnectionList _send_connections;
+	ARDOUR::DataType _data_type;
 
 	static Glib::RefPtr<Gdk::Pixbuf> _slider;
 };