diff --git a/configure.ac b/configure.ac
index f59aa32c28..4d08e4eea8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -165,7 +165,7 @@ GST_PLUGINS_ALL="\
         cutter deinterlace flx goom intfloat law level\
         median mpeg1enc mpeg1sys mpeg1videoparse mpeg2enc mpeg2sub\
         mpegaudio mpegaudioparse mpegstream mpegtypes modplug\
-        passthrough playondemand rtjpeg silence sine\
+        monoscope passthrough playondemand rtjpeg silence sine\
         smooth spectrum speed stereo stereomono\
         synaesthesia udp videoscale volenv volume vumeter wavparse y4m"
 
@@ -734,6 +734,7 @@ gst/mpegstream/Makefile
 gst/mpegtypes/Makefile
 gst/modplug/Makefile
 gst/modplug/libmodplug/Makefile
+gst/monoscope/Makefile
 gst/passthrough/Makefile
 gst/playondemand/Makefile
 gst/rtjpeg/Makefile
diff --git a/gst/synaesthesia/gstsynaesthesia.c b/gst/synaesthesia/gstsynaesthesia.c
index 3ed8002e77..708076d82f 100644
--- a/gst/synaesthesia/gstsynaesthesia.c
+++ b/gst/synaesthesia/gstsynaesthesia.c
@@ -236,7 +236,9 @@ gst_synaesthesia_chain (GstPad *pad, GstBuffer *bufin)
 
   GST_DEBUG (0, "input buffer has %d samples\n", samples_in);
 
+  /* FIXME: should really select the first 1024 samples after the timestamp. */
   if (GST_BUFFER_TIMESTAMP (bufin) < synaesthesia->next_time || samples_in < 1024) {
+    GST_DEBUG (0, "timestamp is %llu: want >= %llu\n", GST_BUFFER_TIMESTAMP (bufin), synaesthesia->next_time);
     gst_buffer_unref (bufin);
     return;
   }