diff -u -r a/src/core/core_sound.c b/src/core/core_sound.c
--- a/src/core/core_sound.c	2013-11-14 10:24:28.935681451 +0000
+++ b/src/core/core_sound.c	2013-11-14 10:15:10.119688938 +0000
@@ -314,7 +314,7 @@
      D_ASSERT( core->shared->buffer_pool != NULL );
 
      /* Create a new object in the buffer pool. */
-     return (CoreSoundBuffer*) fusion_object_create( core->shared->buffer_pool, core->world );
+     return (CoreSoundBuffer*) fusion_object_create( core->shared->buffer_pool, core->world, core->fusion_id );
 }
 
 CorePlayback *
@@ -325,7 +325,7 @@
      D_ASSERT( core->shared->playback_pool != NULL );
 
      /* Create a new object in the playback pool. */
-     return (CorePlayback*) fusion_object_create( core->shared->playback_pool, core->world );
+     return (CorePlayback*) fusion_object_create( core->shared->playback_pool, core->world, core->fusion_id );
 }
 
 DirectResult