diff --git a/Themes/_fallback/Languages/en.ini b/Themes/_fallback/Languages/en.ini
index 1e7b06f2f7..ca64d50afe 100644
--- a/Themes/_fallback/Languages/en.ini
+++ b/Themes/_fallback/Languages/en.ini
@@ -597,6 +597,7 @@ AllGroups=All Groups
 Alternate=Alternate
 Always=Always
 Animations=Animations
+Arbitrary Remap Columns=Arbitrarily Remap
 Arcade Style=Arcade Style
 Ask=Ask
 AttackMines=AttackMines
@@ -1402,6 +1403,7 @@ Enter a new preview start.=Enter when the music sample starts.
 Enter a new preview length.=Enter how long the music sample lasts.
 Enter a new min BPM.=Enter the minimum displayed BPM.
 Enter a new max BPM.=Enter the maximum displayed BPM.
+Enter the new track mapping.=Enter the new track mapping.
 More than %d notes per measure is not allowed.  This change has been reverted.=More than %d notes per measure is not allowed.  This change has been reverted.
 No backgrounds available=No backgrounds available
 EditHelpText=Up/Down:\n     change beat\nLeft/Right:\n     change snap\nNumber keys:\n     add/remove\n     tap note\nN and M keys:\n     swap tap notes\nCtrl + N/M:\n     swap cycled segment\nCtrl + ,/.:\n     cycle segments\nCreate hold note:\n     Hold a number\n     while moving\n     Up or Down\nCreate roll note:\n      Hold Shift,\n      then create a\n      hold note.\nSpace bar:  Set area\n     marker\nT key: Switch Timing\nEnter: Area Menu\nA Key: Alter Menu\nEscape: Main Menu\nF4: Timing Menu\nF1: Show help\n
diff --git a/src/NoteDataUtil.cpp b/src/NoteDataUtil.cpp
index ce0fcb8d8e..5d0e08cfbe 100644
--- a/src/NoteDataUtil.cpp
+++ b/src/NoteDataUtil.cpp
@@ -2274,6 +2274,14 @@ void NoteDataUtil::SwapUpDown(NoteData& inout, StepsType st)
 	inout.RevalidateATIs(vector<int>(), false);
 }
 
+void NoteDataUtil::ArbitraryRemap(NoteData& inout, int* mapping)
+{
+	NoteData tempND;
+	tempND.LoadTransformed(inout, inout.GetNumTracks(), mapping);
+	inout.CopyAll(tempND);
+	inout.RevalidateATIs(vector<int>(), false);
+}
+
 
 struct ValidRow
 {
diff --git a/src/NoteDataUtil.h b/src/NoteDataUtil.h
index 8b6aa382bb..9b25e718b8 100644
--- a/src/NoteDataUtil.h
+++ b/src/NoteDataUtil.h
@@ -167,6 +167,7 @@ namespace NoteDataUtil
 	void ShiftLeft( NoteData &inout );
 	void ShiftRight( NoteData &inout );
 	void SwapUpDown( NoteData &inout, StepsType st );
+	void ArbitraryRemap( NoteData &inout, int* mapping );
 
 	void SnapToNearestNoteType( NoteData &inout, NoteType nt1, NoteType nt2, int iStartIndex, int iEndIndex );
 
diff --git a/src/RageUtil.cpp b/src/RageUtil.cpp
index 049b07c8a3..872734c1f4 100644
--- a/src/RageUtil.cpp
+++ b/src/RageUtil.cpp
@@ -1751,6 +1751,16 @@ void MakeLower( wchar_t *p, size_t iLen )
 	UnicodeUpperLower( p, iLen, g_LowerCase );
 }
 
+bool operator>>(const RString& lhs, int& rhs)
+{
+	return istringstream(lhs) >> rhs;
+}
+
+bool operator>>(const RString& lhs, float& rhs)
+{
+	return istringstream(lhs) >> rhs;
+}
+
 int StringToInt( const RString &sString )
 {
 	int ret;
diff --git a/src/RageUtil.h b/src/RageUtil.h
index e3a83e576f..058727b85f 100644
--- a/src/RageUtil.h
+++ b/src/RageUtil.h
@@ -418,6 +418,9 @@ RString IntToString( const int &iNum );
 float StringToFloat( const RString &sString );
 RString FloatToString( const float &num );
 bool StringToFloat( const RString &sString, float &fOut );
+// Better than IntToString because you can check for success.
+bool operator>>(const RString& lhs, int& rhs);
+bool operator>>(const RString& lhs, float& rhs);
 
 RString WStringToRString( const wstring &sString );
 RString WcharToUTF8( wchar_t c );
diff --git a/src/ScreenEdit.cpp b/src/ScreenEdit.cpp
index 57b0dd0a0a..7fe8c4d02e 100644
--- a/src/ScreenEdit.cpp
+++ b/src/ScreenEdit.cpp
@@ -62,6 +62,7 @@ AutoScreenMessage( SM_UpdateTextInfo );
 AutoScreenMessage( SM_BackFromMainMenu );
 AutoScreenMessage( SM_BackFromAreaMenu );
 AutoScreenMessage( SM_BackFromAlterMenu );
+AutoScreenMessage( SM_BackFromArbitraryRemap );
 AutoScreenMessage( SM_BackFromStepsInformation );
 AutoScreenMessage( SM_BackFromStepsData );
 AutoScreenMessage( SM_BackFromOptions );
@@ -616,7 +617,7 @@ static MenuDef g_AlterMenu(
 	MenuRowDef(ScreenEdit::alter,			"Alter",				true, 
 	      EditMode_Practice, true, true, 0, "Autogen To Fill Width","Backwards","Swap Sides",
 	      "Copy Left To Right","Copy Right To Left","Clear Left","Clear Right",
-		"Collapse To One","Collapse Left","Shift Left","Shift Right", "Swap Up/Down" ),
+		"Collapse To One","Collapse Left","Shift Left","Shift Right", "Swap Up/Down", "Arbitrary Remap Columns" ),
 	MenuRowDef(ScreenEdit::tempo,			"Tempo",				true, 
 	      EditMode_Full, true, true, 0, "Compress 2x","Compress 3->2",
 	      "Compress 4->3","Expand 3->4","Expand 2->3","Expand 2x" ),
@@ -3285,6 +3286,10 @@ void ScreenEdit::HandleScreenMessage( const ScreenMessage SM )
 	{
 		HandleAlterMenuChoice( (AlterMenuChoice)ScreenMiniMenu::s_iLastRowCode, ScreenMiniMenu::s_viLastAnswers );
 	}
+	else if( SM == SM_BackFromArbitraryRemap )
+	{
+		HandleArbitraryRemapping(ScreenTextEntry::s_sLastAnswer);
+	}
 	else if( SM == SM_BackFromStepsInformation )
 	{
 		HandleStepsInformationChoice( (StepsInformationChoice)ScreenMiniMenu::s_iLastRowCode, ScreenMiniMenu::s_viLastAnswers );
@@ -4532,6 +4537,66 @@ void ScreenEdit::HandleMainMenuChoice( MainMenuChoice c, const vector<int> &iAns
 	GAMESTATE->SetProcessedTimingData(NULL);
 }
 
+static LocalizedString ENTER_ARBITRARY_MAPPING( "ScreenEdit", "Enter the new track mapping." );
+static bool ConvertMappingInputToMapping(RString const& mapstr, int* mapping, RString& error)
+{
+	vector<RString> mapping_input;
+	split(mapstr, ",", mapping_input);
+	int tracks_for_type= GAMEMAN->GetStepsTypeInfo(GAMESTATE->m_pCurSteps[0]->m_StepsType).iNumTracks;
+	if(mapping_input.size() > tracks_for_type)
+	{
+		error= "Too many tracks specified.";
+		return false;
+	}
+	// mapping_input.size() < tracks_for_type is not checked because
+	// unspecified tracks are mapped directly. -Kyz
+	size_t track= 0;
+	// track will be used for filling in the unspecified part of the mapping.
+	for(; track < mapping_input.size(); ++track)
+	{
+		if(mapping_input[track].empty())
+		{
+			mapping[track]= track;
+		}
+		else if(!(mapping_input[track] >> mapping[track]))
+		{
+			error= "'" + mapping_input[track] + "' is not a track id.";
+			return false;
+		}
+		if(mapping[track] < 0 || mapping[track] >= tracks_for_type)
+		{
+			error= ssprintf("Entry %d, '%s', '%d' is out of range 0 to %d.", track, mapping_input[track].c_str(), mapping[track], tracks_for_type-1);
+			return false;
+		}
+	}
+	for(; track < tracks_for_type; ++track)
+	{
+		mapping[track]= track;
+	}
+	return true;
+}
+
+static bool ArbitraryRemapValidate(const RString& answer, RString& error_out)
+{
+	int mapping[MAX_NOTE_TRACKS];
+	return ConvertMappingInputToMapping(answer, mapping, error_out);
+}
+
+void ScreenEdit::HandleArbitraryRemapping(RString const& mapstr)
+{
+	const NoteData OldClipboard( m_Clipboard );
+	HandleAlterMenuChoice( cut, false );
+	int mapping[MAX_NOTE_TRACKS];
+	RString error;
+	// error is actually reported by the validate function, and unused here.
+	if(ConvertMappingInputToMapping(mapstr, mapping, error))
+	{
+		NoteDataUtil::ArbitraryRemap(m_Clipboard, mapping);
+	}
+	HandleAreaMenuChoice( paste_at_begin_marker, false );
+	m_Clipboard = OldClipboard;
+}
+
 void ScreenEdit::HandleAlterMenuChoice(AlterMenuChoice c, const vector<int> &iAnswers, bool bAllowUndo)
 {
 	ASSERT_M(m_NoteFieldEdit.m_iBeginMarker!=-1 && m_NoteFieldEdit.m_iEndMarker!=-1,
@@ -4677,6 +4742,14 @@ void ScreenEdit::HandleAlterMenuChoice(AlterMenuChoice c, const vector<int> &iAn
 				case shift_left:		NoteDataUtil::ShiftLeft( m_Clipboard );			break;
 				case shift_right:		NoteDataUtil::ShiftRight( m_Clipboard );		break;
 				case swap_up_down: NoteDataUtil::SwapUpDown(m_Clipboard, GAMESTATE->m_pCurSteps[0]->m_StepsType); break;
+				case arbitrary_remap:
+					ScreenTextEntry::TextEntry(
+						SM_BackFromArbitraryRemap, ENTER_ARBITRARY_MAPPING,
+						"0, 1, 2, 3", MAX_NOTE_TRACKS * 4,
+						// 2 chars for digit, one for comma, one for space.
+						ArbitraryRemapValidate
+				);
+					break;
 			}
 			
 			HandleAreaMenuChoice( paste_at_begin_marker, false );
diff --git a/src/ScreenEdit.h b/src/ScreenEdit.h
index 4c6e7b63bf..79836f08de 100644
--- a/src/ScreenEdit.h
+++ b/src/ScreenEdit.h
@@ -442,6 +442,7 @@ public:
 		modify_keysounds_at_row, /**< Modify the keysounds at this row. */
 		NUM_AREA_MENU_CHOICES
 	};
+	void HandleArbitraryRemapping(RString const& mapstr);
 	void HandleAlterMenuChoice(AlterMenuChoice c,
 				   const vector<int> &iAnswers,
 				   bool bAllowUndo = true);
@@ -502,6 +503,7 @@ public:
 		shift_left,
 		shift_right,
 		swap_up_down,
+		arbitrary_remap,
 		NUM_ALTER_TYPES 
 	};
 	enum TempoType