diff --git a/library/au_sendreceive.py b/library/au_sendreceive.py
index 8db8ffd..5f46860 100755
--- a/library/au_sendreceive.py
+++ b/library/au_sendreceive.py
@@ -66,7 +66,7 @@ def __call__( self, samples ):
             sample_id += 1
 
         if silent_count < 512:
-            print "Could not find silence before preamble"
+            print "Could not find silence before preamble -- too much noise?"
             return []
 
         print 'found carrier'
diff --git a/response/PS5_eyedgm.py b/response/PS5_eyedgm.py
index 2950fb9..95e2531 100644
--- a/response/PS5_eyedgm.py
+++ b/response/PS5_eyedgm.py
@@ -2,7 +2,7 @@
 import au_sendreceive
 import numpy
 import matplotlib
-matplotlib.use('macosx')
+#matplotlib.use('macosx')
 import matplotlib.pyplot as p
 import PS5_tests
 
@@ -77,10 +77,12 @@ def plot_eye_diagram(channel,plot_label, samples_per_bit):
 #    channel2 = PS5_tests.channel(channelid='2')
     auchan = au_sendreceive.channel()
 
+    p.ion()
+
     # plot the eye diagram for the three virtual channels
 #    plot_eye_diagram(channel0,'0',samples_per_bit=50)
 #    plot_eye_diagram(channel1,'1',samples_per_bit=50)
 #    plot_eye_diagram(channel2,'2',samples_per_bit=50)
-    plot_eye_diagram(auchan,'audio',samples_per_bit=4)
+    plot_eye_diagram(auchan,'audio',samples_per_bit=50)
 
     p.show()