diff --git a/c-syncedit.cc b/c-syncedit.cc
index b96fe0c..063570d 100644
--- a/c-syncedit.cc
+++ b/c-syncedit.cc
@@ -192,62 +192,109 @@ void SyncEditor::ReplaceCurve(
 /*----------------------------------------------------------------------------*/
 
 void SyncEditor::DeleteCurve(
-		T_String const& id ) noexcept
+		T_SyncTrackId const& id ) noexcept
 {
-	auto const* const curve{ Common::Sync( ).getCurve( id ) };
-	if ( !curve ) {
+	auto& sync{ Common::Sync( ) };
+
+	auto const* const ovr{ id.isOverride ? sync.getOverride( id.id ) : nullptr };
+	if ( id.isOverride && !ovr ) {
 		return;
 	}
 
+	const uint32_t nCurves{ ovr ? ovr->inputNames( ).size( ) : 1 };
+	T_String cNames[ nCurves ];
+	if ( ovr ) {
+		bool hasNonNull{ false };
+		for ( auto i = 0u ; i < nCurves ; i ++ ) {
+			cNames[ i ] = ovr->inputNames( )[ i ];
+			hasNonNull = hasNonNull || sync.getCurve( cNames[ i ] );
+		}
+		if ( !hasNonNull ) {
+			return;
+		}
+	} else {
+		if ( !sync.getCurve( id.id ) ) {
+			return;
+		}
+		cNames[ 0 ] = id.id;
+	}
+
 	// Create undo entry
 	auto& undo{ dynamic_cast< T_UndoSyncChanges& >(
 			Common::Undo( ).add< T_UndoSyncChanges >( ) ) };
-	undo.curveDeletion( *curve );
 
-	// Delete curve
-	Common::Sync( ).removeCurve( id );
+	// Delete curves
+	for ( T_String const& cn : cNames ) {
+		auto const* const curve{ sync.getCurve( cn ) };
+		if ( curve ) {
+			undo.curveDeletion( *curve );
+			Common::Sync( ).removeCurve( cn );
+		}
+	}
 }
 
 /*----------------------------------------------------------------------------*/
 
 void SyncEditor::AppendSegment(
-		T_String const& id ,
+		T_SyncTrackId const& id ,
 		uint32_t nsDuration ) noexcept
 {
 	assert( nsDuration > 0 );
 
 	auto& sync{ Common::Sync( ) };
-	auto const* const curve{ sync.getCurve( id ) };
+
+	auto const* const ovr{ id.isOverride ? sync.getOverride( id.id ) : nullptr };
+	if ( id.isOverride && !ovr ) {
+		return;
+	}
+
+	const uint32_t nCurves{ ovr ? ovr->inputNames( ).size( ) : 1 };
+	T_SyncCurve const* curves[ nCurves ];
+	T_String cNames[ nCurves ];
+	if ( ovr ) {
+		for ( auto i = 0u ; i < nCurves ; i ++ ) {
+			cNames[ i ] = ovr->inputNames( )[ i ];
+			curves[ i ] = sync.getCurve( cNames[ i ] );
+		}
+	} else {
+		cNames[ 0 ] = id.id;
+		curves[ 0 ] = sync.getCurve( id.id );
+	}
+
 	auto& undo{ dynamic_cast< T_UndoSyncChanges& >(
 			Common::Undo( ).add< T_UndoSyncChanges >( ) ) };
 
-	if ( curve && !curve->segments.empty( ) ) {
-		const float lastValue{ [&](){
-			auto const& lSeg{ curve->segments.last( ) };
-			return lSeg.values.last( );
-		}( ) };
-		auto nCurve{ *curve };
-		auto& nSeg{ nCurve.segments.addNew( ) };
-		nSeg.type = T_SyncSegment::LINEAR;
-		nSeg.values.add( lastValue );
-		nSeg.values.add( lastValue );
-		nSeg.durations.add( nsDuration );
+	for ( auto i = 0u ; i < nCurves ; i ++ ) {
+		auto const* const curve{ curves[ i ] };
+		if ( curve && !curve->segments.empty( ) ) {
+			const float lastValue{ [&](){
+				auto const& lSeg{ curve->segments.last( ) };
+				return lSeg.values.last( );
+			}( ) };
+			auto nCurve{ *curve };
+			auto& nSeg{ nCurve.segments.addNew( ) };
+			nSeg.type = T_SyncSegment::LINEAR;
+			nSeg.values.add( lastValue );
+			nSeg.values.add( lastValue );
+			nSeg.durations.add( nsDuration );
 
-		undo.curveReplacement( *curve , nCurve );
-		sync.setCurve( std::move( nCurve ) );
-	} else {
-		T_SyncCurve nCurve;
-		nCurve.name = id;
+			undo.curveReplacement( *curve , nCurve );
+			sync.setCurve( std::move( nCurve ) );
+		} else {
+			T_SyncCurve nCurve;
+			nCurve.name = cNames[ i ];
 
-		const auto value{ sync.inputs( )[ sync.inputPos( id ) ] };
-		auto& nSeg{ nCurve.segments.addNew( ) };
-		nSeg.type = T_SyncSegment::LINEAR;
-		nSeg.values.add( value );
-		nSeg.values.add( value );
-		nSeg.durations.add( nsDuration );
+			const auto value{ sync.inputs( )[
+				sync.inputPos( cNames[ i ] ) ] };
+			auto& nSeg{ nCurve.segments.addNew( ) };
+			nSeg.type = T_SyncSegment::LINEAR;
+			nSeg.values.add( value );
+			nSeg.values.add( value );
+			nSeg.durations.add( nsDuration );
 
-		undo.curveCreation( nCurve );
-		sync.setCurve( std::move( nCurve ) );
+			undo.curveCreation( nCurve );
+			sync.setCurve( std::move( nCurve ) );
+		}
 	}
 }
 
diff --git a/c-syncedit.hh b/c-syncedit.hh
index c064ee1..b8bf235 100644
--- a/c-syncedit.hh
+++ b/c-syncedit.hh
@@ -77,6 +77,30 @@ class T_UndoDurationChanges final : public T_UndoSyncChanges
 };
 
 
+/*= TRACK IDENTIFIER =========================================================*/
+
+struct T_SyncTrackId
+{
+	T_String id;
+	bool isOverride;
+
+	bool operator ==( T_SyncTrackId const& other ) const noexcept
+	{
+		return id == other.id && isOverride == other.isOverride;
+	}
+
+	bool operator !=( T_SyncTrackId const& other ) const noexcept
+	{
+		return id != other.id || isOverride != other.isOverride;
+	}
+};
+
+inline uint32_t ComputeHash( T_SyncTrackId const& id ) noexcept
+{
+	return ComputeHash( id.id ) ^ ( id.isOverride ? 0xffffffff : 0 );
+}
+
+
 /*= EDITION FUNCTIONS ========================================================*/
 
 struct SyncEditor final
@@ -96,16 +120,16 @@ struct SyncEditor final
 	static void ReplaceCurve(
 			T_SyncCurve replacement ) noexcept;
 
-	// Delete a curve's record completely.
+	// Delete a curve's (or an override's) record completely.
 	static void DeleteCurve(
-			T_String const& id ) noexcept;
+			T_SyncTrackId const& id ) noexcept;
 
 	//----------------------------------------------------------------------
 
 	// Append a segment with the specified amount of units at the end of
 	// the curve. If the curve does not exist it will be created.
 	static void AppendSegment(
-			T_String const& id ,
+			T_SyncTrackId const& id ,
 			uint32_t nsDuration ) noexcept;
 
 	// Delete a segment from a curve.
diff --git a/ui-sequencer.cc b/ui-sequencer.cc
index bf71eb7..2d55c52 100644
--- a/ui-sequencer.cc
+++ b/ui-sequencer.cc
@@ -145,30 +145,6 @@ bool T_ChangeDurationDialog_::onButton(
 }
 
 
-/*= T_SyncTrackId_ ===========================================================*/
-
-struct T_SyncTrackId_
-{
-	T_String id;
-	bool isOverride;
-
-	bool operator ==( T_SyncTrackId_ const& other ) const noexcept
-	{
-		return id == other.id && isOverride == other.isOverride;
-	}
-
-	bool operator !=( T_SyncTrackId_ const& other ) const noexcept
-	{
-		return id != other.id || isOverride != other.isOverride;
-	}
-};
-
-uint32_t ComputeHash( T_SyncTrackId_ const& id ) noexcept
-{
-	return ComputeHash( id.id ) ^ ( id.isOverride ? 0xffffffff : 0 );
-}
-
-
 /*= T_SyncViewImpl_ ==========================================================*/
 
 struct T_SyncViewImpl_
@@ -187,7 +163,7 @@ struct T_SyncViewImpl_
 	// Track display data
 	struct T_TrackDisplay
 	{
-		T_SyncTrackId_ id;
+		T_SyncTrackId id;
 		ImRect area;
 		uint32_t dispSegs;
 		uint32_t firstSeg;
@@ -264,7 +240,7 @@ struct T_SyncViewImpl_
 			float& hue ,
 			ImRect const& bb ,
 			ImRect const& container ,
-			T_SyncTrackId_ const& id ,
+			T_SyncTrackId const& id ,
 			T_SyncCurve const* curve ) noexcept;
 
 	void displayTooltips(
@@ -338,7 +314,7 @@ struct T_SyncViewImpl_
 	float curZoomPixel;
 
 	// Selected item
-	T_Optional< T_SyncTrackId_ > selId{ };
+	T_Optional< T_SyncTrackId > selId{ };
 	T_Optional< uint32_t > selSegment;
 	T_Optional< uint32_t > selPoint;
 	bool selPointDnD{ false };
@@ -354,7 +330,7 @@ struct T_SyncViewImpl_
 
 	// Track selection
 	T_KeyValueTable< T_String , bool > sInputs;
-	T_Set< T_SyncTrackId_ > sTracks;
+	T_Set< T_SyncTrackId > sTracks;
 	T_String curveFinder;
 };
 
@@ -943,7 +919,7 @@ void T_SyncViewImpl_::sequencerTrack(
 		float& hue ,
 		ImRect const& bb ,
 		ImRect const& container ,
-		T_SyncTrackId_ const& id ,
+		T_SyncTrackId const& id ,
 		T_SyncCurve const* curve ) noexcept
 {
 	// Don't display if the track is fully hidden
@@ -1353,7 +1329,7 @@ void T_SyncViewImpl_::displayInputSelector( ) noexcept
 	// The list
 	ImGui::BeginChild( "content" );
 	for ( auto const& n : names ) {
-		const T_SyncTrackId_ id{  n , false };
+		const T_SyncTrackId id{  n , false };
 		const bool present{ sTracks.contains( id ) };
 		assert( !present || sInputs.contains( n ) );
 		const bool overriden{ present && *sInputs.get( n ) };
@@ -1415,7 +1391,7 @@ void T_SyncViewImpl_::displayOverrideSelector( ) noexcept
 
 		auto const& ov{ *element.value< A_SyncOverride* >( ) };
 		auto const& id{ ov.id( ) };
-		const bool present{ sTracks.contains( T_SyncTrackId_{ id , true } ) };
+		const bool present{ sTracks.contains( T_SyncTrackId{ id , true } ) };
 		const bool hasCurves{ !present && areOverrideInputsDisplayed( ov ) };
 		const bool consistent{ areOverrideInputsConsistent( ov ) };
 
@@ -1483,7 +1459,7 @@ bool T_SyncViewImpl_::areOverrideInputsDisplayed(
 {
 	auto const& in{ ov.inputNames( ) };
 	for ( auto i = 0u ; i < in.size( ) ; i ++ ) {
-		if ( sTracks.contains( T_SyncTrackId_{ in[ i ] , false } ) ) {
+		if ( sTracks.contains( T_SyncTrackId{ in[ i ] , false } ) ) {
 			return true;
 		}
 	}
@@ -1495,7 +1471,7 @@ void T_SyncViewImpl_::overrideTrackToggled(
 		const bool selected ) noexcept
 {
 	auto const& in{ ov.inputNames( ) };
-	const T_SyncTrackId_ id{ ov.id( ) , true };
+	const T_SyncTrackId id{ ov.id( ) , true };
 
 	// Handle de-selection
 	if ( !selected ) {
@@ -1615,20 +1591,16 @@ void T_SyncViewImpl_::displayTrackWindow( ) noexcept
 		Text( " " );
 		SameLine( 110 );
 		if ( Button( "Clear" , ImVec2{ -1 , 0 } ) ) {
-			assert( !selId->isOverride );
-#warning blah
-			SyncEditor::DeleteCurve( selId->id );
+			SyncEditor::DeleteCurve( *selId );
 		}
 	}
 	if ( tDuration < dDuration ) {
 		Text( " " );
 		SameLine( 110 );
 		if ( Button( "Append segment" , ImVec2{ -1 , 0 } ) ) {
-			assert( !selId->isOverride );
-#warning blah
 			const uint32_t ns{ std::max( 1u ,
 					( sync.durationUnits( ) - duration ) / 2 ) };
-			SyncEditor::AppendSegment( selId->id , ns );
+			SyncEditor::AppendSegment( *selId , ns );
 		}
 	}