diff --git a/Makefile b/Makefile
index 15f19fd..a9f6c13 100644
--- a/Makefile
+++ b/Makefile
@@ -43,6 +43,7 @@ COMMON = \
 DEMO = \
 	 demo.cc \
 	 main.cc \
+	 syncedit.cc \
 	 syncview.cc \
 	 undo.cc \
 # END DEMO
diff --git a/sync.cc b/sync.cc
index e0c23a2..d8831ae 100644
--- a/sync.cc
+++ b/sync.cc
@@ -164,17 +164,6 @@ void T_SyncTime::setDuration(
 
 /*= T_SyncCurves =============================================================*/
 
-void T_SyncCurves::clear( )
-{
-	curves.clear( );
-}
-
-void T_SyncCurves::setCurve(
-		T_SyncCurve curve )
-{
-	curves.set( std::move( curve ) );
-}
-
 int32_t T_SyncCurves::indexOf(
 		T_String const& name ) noexcept
 {
@@ -597,6 +586,14 @@ void T_SyncManager::setCurve(
 	updateCurveCaches( );
 }
 
+void T_SyncManager::removeCurve(
+		T_String const& curve ) noexcept
+{
+	if ( curves_.removeCurve( curve ) ) {
+		updateCurveCaches( );
+	}
+}
+
 void T_SyncManager::curvesChanged_( )
 {
 	bool missing;
diff --git a/sync.hh b/sync.hh
index 0bf4b0e..0472e42 100644
--- a/sync.hh
+++ b/sync.hh
@@ -74,8 +74,12 @@ struct T_SyncCurves
 		: curves( []( T_SyncCurve const& c ) -> T_String { return c.name; } )
 	{ }
 
-	void clear( );
-	void setCurve( T_SyncCurve curve );
+	void clear( ) noexcept
+		{ curves.clear( ); }
+	void setCurve( T_SyncCurve curve ) noexcept
+		{ curves.set( std::move( curve ) ); }
+	bool removeCurve( T_String const& curve ) noexcept
+		{ return curves.remove( curve ); }
 
 	// Returns -1 on lookup failure
 	int32_t indexOf( T_String const& name ) noexcept;
@@ -342,6 +346,7 @@ struct T_SyncManager : public virtual A_MouseCtrl
 	void checkCurveFile( );
 	void clearCurves( );
 	void setCurve( T_SyncCurve curve );
+	void removeCurve( T_String const& curve ) noexcept;
 
     private:
 	void curvesChanged_( );
diff --git a/syncedit.cc b/syncedit.cc
new file mode 100644
index 0000000..787ff5f
--- /dev/null
+++ b/syncedit.cc
@@ -0,0 +1,83 @@
+#include "externals.hh"
+#include "syncedit.hh"
+#include "globals.hh"
+
+
+/*= T_UndoSyncChanges ==========================================================*/
+
+void T_UndoSyncChanges::undo( ) const noexcept
+{
+	auto& sync{ Globals::Sync( ) };
+	const auto n{ changes_.size( ) };
+	for ( auto i = 0u ; i < n ; i ++ ) {
+		auto const& c( changes_[ i ] );
+		if ( c.before ) {
+			sync.setCurve( *c.before );
+		} else {
+			sync.removeCurve( c.inputId );
+		}
+	}
+}
+
+void T_UndoSyncChanges::redo( ) const noexcept
+{
+	auto& sync{ Globals::Sync( ) };
+	const auto n{ changes_.size( ) };
+	for ( auto i = 0u ; i < n ; i ++ ) {
+		auto const& c( changes_[ i ] );
+		if ( c.after ) {
+			sync.setCurve( *c.after );
+		} else {
+			sync.removeCurve( c.inputId );
+		}
+	}
+}
+
+/*------------------------------------------------------------------------------*/
+
+T_UndoSyncChanges& T_UndoSyncChanges::curveCreation(
+		T_SyncCurve curve ) noexcept
+{
+#ifndef NDEBUG
+	{
+		const auto n{ changes_.size( ) };
+		for ( auto i = 0u ; i < n ; i ++ ) {
+			assert( changes_[ i ].inputId != curve.name );
+		}
+	}
+#endif
+	changes_.addNew( true , std::move( curve ) );
+	return *this;
+}
+
+T_UndoSyncChanges& T_UndoSyncChanges::curveDeletion(
+		T_SyncCurve curve ) noexcept
+{
+#ifndef NDEBUG
+	{
+		const auto n{ changes_.size( ) };
+		for ( auto i = 0u ; i < n ; i ++ ) {
+			assert( changes_[ i ].inputId != curve.name );
+		}
+	}
+#endif
+	changes_.addNew( std::move( curve ) );
+	return *this;
+}
+
+T_UndoSyncChanges& T_UndoSyncChanges::curveReplacement(
+		T_SyncCurve before ,
+		T_SyncCurve after ) noexcept
+{
+	assert( before.name == after.name );
+#ifndef NDEBUG
+	{
+		const auto n{ changes_.size( ) };
+		for ( auto i = 0u ; i < n ; i ++ ) {
+			assert( changes_[ i ].inputId != before.name );
+		}
+	}
+#endif
+	changes_.addNew( std::move( before ) , std::move( after ) );
+	return *this;
+}
diff --git a/syncedit.hh b/syncedit.hh
new file mode 100644
index 0000000..828eafa
--- /dev/null
+++ b/syncedit.hh
@@ -0,0 +1,53 @@
+#pragma once
+#include "sync.hh"
+#include "undo.hh"
+
+
+/*= GENERAL STRUCTURE FOR SYNC EDITOR UNDOS ====================================*/
+
+class T_UndoSyncChanges : public A_UndoAction
+{
+    protected:
+	struct T_CurveChange_
+	{
+		T_String inputId;
+		T_Optional< T_SyncCurve > before;
+		T_Optional< T_SyncCurve > after;
+
+		explicit T_CurveChange_( T_SyncCurve before ) noexcept
+			: inputId{ before.name } ,
+				before{ std::move( before ) } ,
+				after{ }
+		{}
+
+		T_CurveChange_( const bool ,
+				T_SyncCurve after ) noexcept
+			: inputId{ after.name } , before{ } ,
+				after{ std::move( after ) }
+		{}
+
+		T_CurveChange_( T_SyncCurve before ,
+				T_SyncCurve after ) noexcept
+			: inputId{ before.name } ,
+				before{ std::move( before ) } ,
+				after{ std::move( after ) }
+		{}
+	};
+	T_AutoArray< T_CurveChange_ , 4 , 32 > changes_;
+
+    public:
+	T_UndoSyncChanges( ) noexcept = default;
+	DEF_MOVE( T_UndoSyncChanges );
+	NO_COPY( T_UndoSyncChanges );
+
+	void undo( ) const noexcept override;
+	void redo( ) const noexcept override;
+
+	T_UndoSyncChanges& curveCreation(
+			T_SyncCurve curve ) noexcept;
+	T_UndoSyncChanges& curveDeletion(
+			T_SyncCurve curve ) noexcept;
+	T_UndoSyncChanges& curveReplacement(
+			T_SyncCurve before ,
+			T_SyncCurve after ) noexcept;
+};