diff --git a/DDExamples/ILDExSimu/src/ILDExEventAction.cpp b/DDExamples/ILDExSimu/src/ILDExEventAction.cpp
index e2a8aef68fcb03fcc8f6c5da00e15d2f79011d54..50751ca740b9e5073470b6ba6f3383ffb7f4ea5a 100644
--- a/DDExamples/ILDExSimu/src/ILDExEventAction.cpp
+++ b/DDExamples/ILDExSimu/src/ILDExEventAction.cpp
@@ -28,7 +28,7 @@
 #include "UTIL/ILDConf.h"
 
 
-#define DEBUG 1
+#define DEBUG 0
 
 
 //------ helper functions ------------------
@@ -205,7 +205,9 @@ void ILDExEventAction::EndOfEventAction(const G4Event* evt)
 	
 	col->setFlag( UTIL::make_bitset32(  LCIO::CHBIT_LONG, LCIO::CHBIT_STEP ) ); 
 
-	std::cout << " setting collection flag: " << col->getFlag() << std::endl ;
+#if DEBUG
+       	std::cout << " setting collection flag:  0x" << std::hex << col->getFlag()  << std::dec << std::endl ;
+#endif	
 
 	for(int j=0,N= hCol->GetSize() ; j<N ; ++j) {
 	  
diff --git a/DDG4/src/Geant4SensitiveDetector.cpp b/DDG4/src/Geant4SensitiveDetector.cpp
index 0bd1d2e76e06d8a2f9da124a65a86e92c972f2a9..8bfac647f82ca9a6272a2ba29b05744a2da3ac5a 100644
--- a/DDG4/src/Geant4SensitiveDetector.cpp
+++ b/DDG4/src/Geant4SensitiveDetector.cpp
@@ -19,7 +19,7 @@
 
 #include "TGeoNode.h"
 
-#define DEBUG 1
+#define DEBUG 0
 
 
 // C/C++ include files
diff --git a/DDG4/src/Geant4TrackerSD.cpp b/DDG4/src/Geant4TrackerSD.cpp
index 99ed7f8863157d770a04164edc7306376d54794d..73c09ba2c8c82c12b51a4dd450bb25440e6db7b6 100644
--- a/DDG4/src/Geant4TrackerSD.cpp
+++ b/DDG4/src/Geant4TrackerSD.cpp
@@ -32,7 +32,7 @@ namespace DD4hep {  namespace Simulation {
       direction *= new_len/hit_len;
     }
 
-    G4cout << "----------- Geant4GenericSD<Tracker>::buildHits : position : " << prePos << G4endl ;
+    //    G4cout << "----------- Geant4GenericSD<Tracker>::buildHits : position : " << prePos << G4endl ;
     
     Geant4TrackerHit* hit = 
       new Geant4TrackerHit(h.track->GetTrackID(),