diff --git a/dsp/fabla.cxx b/dsp/fabla.cxx
index 986a67c..1c5bd1e 100644
--- a/dsp/fabla.cxx
+++ b/dsp/fabla.cxx
@@ -242,7 +242,7 @@ instantiate(const LV2_Descriptor*     descriptor,
     if ( self->log )
       lv2_log_warning(&self->logger, "Fabla: Warning, your host doesn't support the Worker extension. Loading samples may cause Xruns!");
     else
-      printf("Fabla: Warning, your host doesn't support the Worker extension. Loading samples may cause Xruns!");
+      fprintf(stderr, "Fabla: Warning, your host doesn't support the Worker extension. Loading samples may cause Xruns!");
   }
   
   // initialize master output smoothing state
@@ -363,7 +363,7 @@ connect_port(LV2_Handle instance,
         break;
 
     default:
-      printf("Error: Attempted connect of non-existing port with ID %u \n", port); break;
+      fprintf(stderr, "Error: Attempted connect of non-existing port with ID %u \n", port); break;
   }
 }
 
@@ -816,7 +816,7 @@ work(LV2_Handle                  instance,
      uint32_t                    size,
      const void*                 data)
 {
-  printf("Fabla: Work() now\n" );
+  fprintf(stderr, "Fabla: Work() now\n" );
   FABLA_DSP*  self = (FABLA_DSP*)instance;
   LV2_Atom* atom = (LV2_Atom*)data;
   
@@ -829,18 +829,18 @@ work(LV2_Handle                  instance,
   }
   else
   {
-    printf("Fabla Work()  LoadSample type message\n" );
+    fprintf(stderr, "Fabla Work()  LoadSample type message\n" );
     /* Handle set message (load sample). */
     LV2_Atom_Object* obj = (LV2_Atom_Object*)data;
     
-    printf("Fabla Work()  LV2_Atom_Object atom type %i, body.otype %i \n", obj->atom.type, obj->body.otype );
+    fprintf(stderr, "Fabla Work()  LV2_Atom_Object atom type %i, body.otype %i \n", obj->atom.type, obj->body.otype );
     
     /* Get file path from message */
     const LV2_Atom_Int* sampleNum = 0;// FIXME read_set_file_sample_number(&self->uris, obj);
     
     if ( !sampleNum )
     {
-      printf("Fabla Work()  LoadSample Sample number not found in Atom\n" );
+      fprintf(stderr, "Fabla Work()  LoadSample Sample number not found in Atom\n" );
     }
     else
     {
@@ -849,7 +849,7 @@ work(LV2_Handle                  instance,
     
     const LV2_Atom* file_path = 0; //fixme: take from Atom message
     if (!file_path) {
-      printf( "Fabla Work()  LoadSample FILE PATH NOT VALID\n" );
+      fprintf(stderr,  "Fabla Work()  LoadSample FILE PATH NOT VALID\n" );
       return LV2_WORKER_ERR_UNKNOWN;
     }
     
@@ -961,7 +961,7 @@ save(LV2_Handle                instance,
   
   if ( !map_path )
   {
-    printf("Error: map path not available! SAVE DID NOT COMPLETE!\n" );
+    fprintf(stderr, "Error: map path not available! SAVE DID NOT COMPLETE!\n" );
     return LV2_STATE_ERR_NO_FEATURE;
   }
   
@@ -977,7 +977,7 @@ save(LV2_Handle                instance,
       
       if ( apath )
       {
-        printf("Storing on pad %i, apath %s\n", i, apath );
+        fprintf(stderr, "Storing on pad %i, apath %s\n", i, apath );
         store(handle,
             self->uris->padFilename[i],
             apath,
@@ -989,7 +989,7 @@ save(LV2_Handle                instance,
       }
       else
       {
-        printf("apath = null on pad %i\n", i );
+        fprintf(stderr, "apath = null on pad %i\n", i );
       }
     }
   }
@@ -1035,13 +1035,13 @@ restore(LV2_Handle                  instance,
         }
         else
         {
-          printf("Error: load_sample() return zero on pad %i\n", i);
+          fprintf(stderr, "Error: load_sample() return zero on pad %i\n", i);
         }
         
       } // path is valid
       else
       {
-        printf( "Error: path of sample not valid from Restore::retrieve()\n");
+        fprintf(stderr, "Error: path of sample not valid from Restore::retrieve()\n");
       }
     }
   }