diff --git a/plugins/LadspaEffect/LadspaMatrixControlDialog.cpp b/plugins/LadspaEffect/LadspaMatrixControlDialog.cpp
index 0aff7990b..4cc6c3725 100644
--- a/plugins/LadspaEffect/LadspaMatrixControlDialog.cpp
+++ b/plugins/LadspaEffect/LadspaMatrixControlDialog.cpp
@@ -164,8 +164,8 @@ void LadspaMatrixControlDialog::updateEffectView( LadspaControls * ladspaControl
 		m_stereoLink->setModel( &ladspaControls->m_stereoLinkModel );
 	}
 
-	connect( ladspaControls, SIGNAL( effectModelChanged( LadspaControls * ) ),
-				this, SLOT( updateEffectView( LadspaControls * ) ),
+	connect( ladspaControls, SIGNAL( effectModelChanged( lmms::LadspaControls * ) ),
+				this, SLOT( updateEffectView( lmms::LadspaControls * ) ),
 							Qt::DirectConnection );
 }
 
diff --git a/src/gui/LadspaMatrixControlView.cpp b/src/gui/LadspaMatrixControlView.cpp
index 6afacfc20..5115796ec 100644
--- a/src/gui/LadspaMatrixControlView.cpp
+++ b/src/gui/LadspaMatrixControlView.cpp
@@ -56,7 +56,7 @@ LadspaMatrixControlView::LadspaMatrixControlView( QWidget * parent,
 		case TOGGLED:
 		{
 			LedCheckBox * toggle = new LedCheckBox(
-				"", this, QString::null, LedCheckBox::Green );
+				"", this, QString(), LedCheckBox::Green );
 			toggle->setModel( m_ladspaControl->toggledModel() );
 			layout->addWidget( toggle );
 			setFixedSize( toggle->width(), toggle->height() );
@@ -81,7 +81,6 @@ LadspaMatrixControlView::LadspaMatrixControlView( QWidget * parent,
 	if( knob != NULL )
 	{
 		knob->setHintText( tr( "Value:" ), "" );
-		knob->setWhatsThis( tr( "Sorry, no help available." ) );
 		layout->addWidget( knob );
 		setFixedSize( knob->width(), knob->height() );
 	}