diff --git a/build/CMakeLists.txt b/build/CMakeLists.txt
index 9cfa7322f..ad476b607 100644
--- a/build/CMakeLists.txt
+++ b/build/CMakeLists.txt
@@ -1,7 +1,7 @@
 #######################################
 # CMAKE guidolib
 #######################################
-cmake_minimum_required(VERSION 3.4)
+cmake_minimum_required(VERSION 3.5)
 project(guidolib)
 
 set (CMAKE_BUILD_TYPE Release)
@@ -66,9 +66,9 @@ if(APPLE)
 		set (IOS_DEPLOYMENT_TARGET 10.0) 
 	else ()
 		message (STATUS "Generates Mac OS project- Use -DIOS=yes to change.")
-		set (CMAKE_CXX_FLAGS -mmacosx-version-min=10.13)
+		set (CMAKE_CXX_FLAGS -mmacosx-version-min=12.00)
 #		set (CMAKE_LDFLAGS -mmacosx-version-min=10.13)
-		set (CMAKE_OSX_DEPLOYMENT_TARGET 10.13)
+		set (CMAKE_OSX_DEPLOYMENT_TARGET 13.0)
 #		set (MACOSX_DEPLOYMENT_TARGET 10.13)
 	endif ()
 endif()
diff --git a/build/tools/CMakeLists.txt b/build/tools/CMakeLists.txt
index 97787af40..ceb65953f 100644
--- a/build/tools/CMakeLists.txt
+++ b/build/tools/CMakeLists.txt
@@ -2,7 +2,7 @@
 # CMAKE guidotools
 #######################################
 project(guidotools)
-cmake_minimum_required(VERSION 3.4)
+cmake_minimum_required(VERSION 3.5)
 
 set (CMAKE_BUILD_TYPE Release)
 
diff --git a/src/engine/graphic/GRMusic.cpp b/src/engine/graphic/GRMusic.cpp
index f663d5707..2fbcffe10 100644
--- a/src/engine/graphic/GRMusic.cpp
+++ b/src/engine/graphic/GRMusic.cpp
@@ -266,7 +266,7 @@ void GRMusic::pagetrace(VGDevice & hdc)
 				const GRSystem* sys = (*sysl)[j];
 				const StaffVector * staves = sys->getStaves();
 				if (staves) {
-					for (int i = staves->GetMinimum(); i <= staves->GetMaximum(); i++) {
+					for (int i = staves->GetMinimum(); i < staves->GetMaximum(); i++) {
 						const GRStaff * staff = staves->Get(i);
 						if (staff) {
 							cerr << "staff --- " << i << endl;
@@ -684,6 +684,28 @@ float GRMusic::getStaffSize(int staffNum) {
         return fStaffSizes[staffNum];
 }
 
+//-------------------------------------------------------------------------------
+GRStaff* GRMusic::getStaff(int staffNum, TYPE_TIMEPOSITION at)
+{
+	for (auto p: mPages) {
+		for (auto s: *(p->getSystems())) {
+			const StaffVector * staves = s->getStaves();
+			if (staves) {
+				int n = 1;
+				for (int i = staves->GetMinimum(); i <= staves->GetMaximum(); i++) {
+					const GRStaff * staff = staves->Get(i);
+					TYPE_TIMEPOSITION start = staff->getRelativeTimePosition();
+					TYPE_TIMEPOSITION end   = staff->getRelativeEndTimePosition();
+					if ((n == staffNum) && (start <= at) && (end >= at) && (start != end))
+						return staves->Get(i);
+					n++;
+				}
+			}
+		}
+	}
+	return nullptr;
+}
+
 //-------------------------------------------------------------------------------
 ARMusicalVoice* GRMusic::getARVoice (int n)
 {
diff --git a/src/engine/graphic/GRMusic.h b/src/engine/graphic/GRMusic.h
index bcb16827c..f7e5a76f0 100644
--- a/src/engine/graphic/GRMusic.h
+++ b/src/engine/graphic/GRMusic.h
@@ -114,6 +114,8 @@ class GRMusic : public GREvent
     
                 void    setStaffSize(int staffNum, float size);
                 float   getStaffSize(int staffNum);
+
+                GRStaff*   getStaff(int staffNum, TYPE_TIMEPOSITION date);
     
 		std::vector<TCollisionInfo> getCollisions() const	{ return fCollisions.list(); }
 
diff --git a/src/engine/graphic/GROctava.cpp b/src/engine/graphic/GROctava.cpp
index edc40e743..a454810f0 100644
--- a/src/engine/graphic/GROctava.cpp
+++ b/src/engine/graphic/GROctava.cpp
@@ -65,6 +65,11 @@ GROctava::~GROctava()
 {
 }
 
+void GROctava::accept (GRVisitor& visitor) {
+	visitor.visitStart (this);
+	visitor.visitEnd (this);
+}
+
 bool GROctava::DeleteStaff(GRStaff * grstaff)
 {
 	delete mAssociated;		// makes sure that associated notes are deleted before the GROctava
diff --git a/src/engine/graphic/GROctava.h b/src/engine/graphic/GROctava.h
index 38a799b12..dffc2cc07 100644
--- a/src/engine/graphic/GROctava.h
+++ b/src/engine/graphic/GROctava.h
@@ -21,6 +21,7 @@
 #include "TagParameterString.h"
 #include "GRARNotationElement.h"
 #include "GRPositionTag.h"
+#include "GRVisitor.h"
 
 class NVstring;
 class GRStaff;
@@ -36,11 +37,13 @@ class GROctava : public GRARNotationElement, public GRPositionTag
 					 GROctava( GRStaff *, const NVstring & txt, const AROctava* ar, bool bassa );
 		virtual 	~GROctava();
 
+		virtual void accept (GRVisitor& visitor);
 		virtual void tellPosition(GObject *caller, const NVPoint & );
 
 		virtual void OnDraw( VGDevice & hdc ) const;
 		virtual void setColRef(const TagParameterString *tps);
 		virtual bool DeleteStaff(GRStaff * grstaff);
+		virtual int  getOctava() const { return fOctava; };
 	
 	private:
 		typedef struct segment {
diff --git a/src/engine/graphic/GRStaff.cpp b/src/engine/graphic/GRStaff.cpp
index 1e0fc0dbf..1125aa839 100644
--- a/src/engine/graphic/GRStaff.cpp
+++ b/src/engine/graphic/GRStaff.cpp
@@ -677,6 +677,7 @@ void GRStaff::accept (GRVisitor& visitor)
 	GuidoPos pos = elts->GetHeadPosition();
 	while (pos) {
 		GRNotationElement * e = elts->GetNext(pos);
+cerr << "GRStaff::accept " << e << endl;
 		e->accept (visitor);
 	}
 	visitor.visitEnd (this);
@@ -902,12 +903,20 @@ float GRStaff::getKeyPosition(TYPE_PITCH pit, int numkeys) const
 /** \brief Returns the graphical y-position of a note.
 
 	Idea: Each clef has a root-note  (violin-
-	clef has G, base-clef has F) and a 
+	clef has G, base-clef has F) and a
 	corresponding staff line
-
 */
 float GRStaff::getNotePosition(TYPE_PITCH pit, TYPE_REGISTER oct) const
 {
+//cerr << "GRStaff::getNotePosition " << pit << " " << oct << " state: " << mStaffState.basepit << " " << mStaffState.baseline << " " <<  mStaffState.baseoct << endl;
+	return getNotePosition(pit, oct, mStaffState.basepit, mStaffState.baseline, mStaffState.baseoct);
+}
+
+// ----------------------------------------------------------------------------
+/** \brief Returns the graphical y-position of a note.
+*/
+float GRStaff::getNotePosition(TYPE_PITCH pit, TYPE_REGISTER oct, int basePitch, int baseLine, int baseOct) const
+{
 // redundant correction of octave: already shifted when the GRNote is created
 //	oct -= mStaffState.octava;	//  depends on current clef.
 
@@ -915,18 +924,18 @@ float GRStaff::getNotePosition(TYPE_PITCH pit, TYPE_REGISTER oct) const
 	float calc = 0;
 	if (pit >= NOTE_C && pit <= NOTE_H)
 	{
-		calc = (float)((mStaffState.basepit - pit ) * myHalfSpace + mStaffState.baseline * getStaffLSPACE() -
-			((int)oct - mStaffState.baseoct) * (7 * myHalfSpace));
+		calc = (float)((basePitch - pit ) * myHalfSpace + baseLine * getStaffLSPACE() -
+			((int)oct - baseOct) * (7 * myHalfSpace));
 	}
 	else if (pit>= NOTE_CIS && pit <= NOTE_DIS)
 	{
-		calc = (float)((mStaffState.basepit - (pit - 7) )* myHalfSpace + mStaffState.baseline * getStaffLSPACE()-
-			((int)oct - mStaffState.baseoct) * (7 * myHalfSpace));
+		calc = (float)((basePitch - (pit - 7) )* myHalfSpace + baseLine * getStaffLSPACE()-
+			((int)oct - baseOct) * (7 * myHalfSpace));
 	}
 	else if (pit>= NOTE_FIS && pit <= NOTE_AIS)
 	{
-		calc = (float)((mStaffState.basepit - (pit - 6) )* myHalfSpace + mStaffState.baseline * getStaffLSPACE() -
-			((int)oct - mStaffState.baseoct) * (7 * myHalfSpace));
+		calc = (float)((basePitch - (pit - 6) )* myHalfSpace + baseLine * getStaffLSPACE() -
+			((int)oct - baseOct) * (7 * myHalfSpace));
 	}
 	return calc;
 }
diff --git a/src/engine/graphic/GRStaff.h b/src/engine/graphic/GRStaff.h
index c048974ff..88cd72aed 100644
--- a/src/engine/graphic/GRStaff.h
+++ b/src/engine/graphic/GRStaff.h
@@ -208,6 +208,7 @@ class GRStaff : public GRCompositeNotationElement
         const ARMeter *			getCurMeter() const		{ return mStaffState.curmeter; }
 
 		virtual float       getNotePosition(TYPE_PITCH pit, TYPE_REGISTER oct) const;
+		virtual float 		getNotePosition(TYPE_PITCH pit, TYPE_REGISTER oct, int basePitch, int baseLine, int baseOct) const;
 		virtual GDirection  getDefaultThroatDirection(TYPE_PITCH pit, TYPE_REGISTER oct) const;
 		virtual int         getNumHelplines(TYPE_PITCH pit, TYPE_REGISTER oct) const;
 		virtual VGColor     getNoteColor(TYPE_PITCH pit) const;
diff --git a/src/engine/include/GUIDOEngine.h b/src/engine/include/GUIDOEngine.h
index 30f6f078b..23b5eefe9 100644
--- a/src/engine/include/GUIDOEngine.h
+++ b/src/engine/include/GUIDOEngine.h
@@ -576,6 +576,18 @@ as by date. Page numbers start at 1.
 	*/
 	GUIDOAPI GuidoErrCode GuidoGetPageDate( CGRHandler inHandleGR, int pageNum, GuidoDate* date);
 
+	/** \brief Gives a pitch position on a staff.
+
+		\param inHandleGR a Guido opaque handle to a GR structure.
+		\param staff a staff number (starts at 1).
+		\param pitch a midi pitch
+		\param date the target date
+		\param x on output: the x position
+		\param y on output: the y position
+		\return a Guido error code.
+	*/
+	GUIDOAPI GuidoErrCode GuidoGetPitchPos( CGRHandler inHandleGR, int staff, int pitch, GuidoDate date, float& x, float& y);
+
 
 	/** \brief Gives the current meter on a given date and voice.
 
diff --git a/src/engine/lib/GUIDOEngine.cpp b/src/engine/lib/GUIDOEngine.cpp
index 199110c29..2bc673960 100644
--- a/src/engine/lib/GUIDOEngine.cpp
+++ b/src/engine/lib/GUIDOEngine.cpp
@@ -67,6 +67,8 @@ using namespace std;
 #include "GRShowVisitor.h"
 #include "TagParametersMaps.h"
 
+#include "GRPitchYVisitor.h"
+
 //#include "GMNCodePrintVisitor.h"
 
 
@@ -336,6 +338,16 @@ GUIDOAPI GuidoErrCode GuidoAR2GR( ARHandler ar, const GuidoLayoutSettings * sett
 	GRHandler grh = CreateGr (ar, gARPageFormat, settings);
 	if (!gr) return guidoErrMemory;
 	*gr = grh;
+
+	float x, y;
+	GuidoDate date;
+	date.num = 3;
+	date.denom = 1;
+	GuidoErrCode err = GuidoGetPitchPos (grh, 1, 60, date, x, y);
+	if (err != guidoNoErr)
+cerr << "GuidoAR2GR GuidoGetPitchPos err " << err << endl;
+else
+cerr << "GuidoAR2GR GuidoGetPitchPos at " << date << " : " << x << " " << y << endl;
 	return guidoNoErr;
 }
 
@@ -617,6 +629,27 @@ GUIDOAPI GuidoErrCode GuidoGetPageDate( CGRHandler inHandleGR, int pageNum, Guid
 	return result ? guidoNoErr : guidoErrBadParameter;
 }
 
+// --------------------------------------------------------------------------
+// introduced in guido 1.71 [DF Nov 30 2023]
+GUIDOAPI GuidoErrCode GuidoGetPitchPos( CGRHandler inHandleGR, int staffnum, int pitch, GuidoDate date, float& x, float& y)
+{
+	if ( ( !inHandleGR ) || ( !inHandleGR->grmusic ) )
+		return guidoErrInvalidHandle;
+
+	TYPE_TIMEPOSITION tp (date.num, date.denom);
+	GRStaff* staff = inHandleGR->grmusic->getStaff (staffnum, tp);
+	if (!staff)
+		return guidoErrBadParameter;
+
+	GRPitchYVisitor v;
+	NVPoint p = v.getPitchPos (staff, pitch, tp);
+	if (!p.x)
+		return guidoErrBadParameter;
+	x = p.x;
+	y = p.y;
+	return guidoNoErr;
+}
+
 // --------------------------------------------------------------------------
 // introduced in guido 1.63 [DF July 1 2016]
 GUIDOAPI GuidoErrCode GuidoGetMeterAt (CARHandler inHandleAR, int voicenum, const GuidoDate &date, GuidoMeter& meter)
diff --git a/src/engine/operations/GRPitchYVisitor.cpp b/src/engine/operations/GRPitchYVisitor.cpp
new file mode 100644
index 000000000..91d1a20cb
--- /dev/null
+++ b/src/engine/operations/GRPitchYVisitor.cpp
@@ -0,0 +1,93 @@
+/*
+  GUIDO Library
+  Copyright (C) 2023 D. Fober
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+
+#include <iostream>
+
+#include "GRPitchYVisitor.h"
+
+#include "GuidoDefs.h"
+#include "GRClef.h"
+#include "GREmpty.h"
+#include "GROctava.h"
+#include "GREvent.h"
+#include "GRSingleNote.h"
+#include "GRSingleRest.h"
+#include "GRStaff.h"
+
+using namespace std;
+
+//-------------------------------------------------------------------------------
+NVPoint GRPitchYVisitor::getPitchPos (GRStaff* staff, int midipitch, TYPE_TIMEPOSITION date)
+{
+	fBasePitch 	= NOTE_G;
+	fBaseLine 	= 3;
+	fBaseOct 	= 1;
+	fOctava 	= 0;
+	fTargetDate = date;
+	fLastDate = -1;
+	fLastX = -1;
+	fDone = false;
+	staff->accept (*this);
+	NVPoint p;
+	if (fDone) {
+		// convert midi pitch in pitch class and octava
+		int oct = (midipitch / 12) - 4;
+		int pitch = midipitch % 12;
+		pitch = ((pitch < 5) ? (pitch / 2) : (pitch+1) / 2) + 2;
+cerr << "GRPitchYVisitor::getPitchPos " << pitch << " " << oct << " date: " << date << endl;
+		float y = staff->getNotePosition ( pitch, oct, fBasePitch, fBaseLine, fBaseOct);
+		p.x = fLastX;
+		p.y = y;
+	}
+cerr << "   resultat : " << p << endl;
+	return p;
+}
+
+//-------------------------------------------------------------------------------
+void GRPitchYVisitor::visitStart (GRSingleNote* o)
+{
+	if (fDone) return;
+cerr << "GRPitchYVisitor::visitStart GRSingleNote " << o << endl;
+	TYPE_TIMEPOSITION date = o->getRelativeTimePosition();
+	if (date > fTargetDate) fDone = true;
+	else fLastX = o->getPosition().x;
+}
+
+//-------------------------------------------------------------------------------
+void GRPitchYVisitor::visitStart (GREmpty* o)
+{
+	if (fDone) return;
+cerr << "GRPitchYVisitor::visitStart GREmpty " << o << endl;
+	TYPE_TIMEPOSITION date = o->getRelativeTimePosition();
+	if (date > fTargetDate) fDone = true;
+	else fLastX = o->getPosition().x;
+}
+
+//-------------------------------------------------------------------------------
+void GRPitchYVisitor::visitStart (GRSingleRest* o)
+{
+	if (fDone) return;
+cerr << "GRPitchYVisitor::visitStart GRSingleRest " << o << endl;
+	TYPE_TIMEPOSITION date = o->getRelativeTimePosition();
+	if (date > fTargetDate) fDone = true;
+	else fLastX = o->getPosition().x;
+}
+
+void GRPitchYVisitor::visitStart (GRClef* o)
+{
+	if (fDone) return;
+	fBasePitch = o->getBasePitch();
+	fBaseOct = o->getBaseOct();
+}
+
+void GRPitchYVisitor::visitStart (GROctava* o)
+{
+	if (fDone) return;
+	fOctava = o->getOctava();
+}
diff --git a/src/engine/operations/GRPitchYVisitor.h b/src/engine/operations/GRPitchYVisitor.h
new file mode 100644
index 000000000..5c98e22ae
--- /dev/null
+++ b/src/engine/operations/GRPitchYVisitor.h
@@ -0,0 +1,44 @@
+/*
+  GUIDO Library
+  Copyright (C) 2023 D. Fober
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+
+#ifndef ___GRPitchYVisitor___
+#define ___GRPitchYVisitor___
+
+#include "defines.h"
+#include "GUIDOEngine.h"
+#include "GRVisitor.h"
+#include "NVPoint.h"
+
+class GRPitchYVisitor : public GRVisitor
+{
+	int fBasePitch;
+	int fBaseLine;
+	int fBaseOct;
+	int fOctava;
+	float fLastX;
+	TYPE_TIMEPOSITION fLastDate = 0;
+	TYPE_TIMEPOSITION fTargetDate = 0;
+	bool fDone = false;
+
+	public:
+				 GRPitchYVisitor() {}
+		virtual ~GRPitchYVisitor() {}
+
+		NVPoint getPitchPos (GRStaff* staff, int pitch, TYPE_TIMEPOSITION date);
+		
+		virtual bool voiceMode () { return true; }
+	
+		virtual void visitStart (GRClef* o);
+		virtual void visitStart (GROctava* o);
+		virtual void visitStart (GRSingleNote* o);
+		virtual void visitStart (GRSingleRest* o);
+		virtual void visitStart (GREmpty* o);
+};
+
+#endif
diff --git a/src/engine/operations/GRVisitor.h b/src/engine/operations/GRVisitor.h
index 7503e2d6a..d7a87bcdc 100644
--- a/src/engine/operations/GRVisitor.h
+++ b/src/engine/operations/GRVisitor.h
@@ -25,6 +25,7 @@ class GRIntens;
 class GRKey;
 class GRMeter;
 class GRMusic;
+class GROctava;
 class GRPage;
 class GRRange;
 class GRSingleNote;
@@ -105,6 +106,9 @@ class GRVisitor
 
 		virtual void visitStart (GRSingleRest* o)	{}
 		virtual void visitEnd   (GRSingleRest* o)	{}
+
+		virtual void visitStart (GROctava* o)	{}
+		virtual void visitEnd   (GROctava* o)	{}
 };
 
 #endif