diff --git a/aircox_liquidsoap/utils.py b/aircox_liquidsoap/utils.py
index 935dd71..6d4f19f 100644
--- a/aircox_liquidsoap/utils.py
+++ b/aircox_liquidsoap/utils.py
@@ -41,7 +41,7 @@ class Connector:
             self.__socket.connect(self.address)
             self.__available = True
         except:
-            print('can not connect to liquidsoap socket {}'.format(self.address))
+            # print('can not connect to liquidsoap socket {}'.format(self.address))
             self.__available = False
             return -1
 
@@ -167,7 +167,7 @@ class Source:
     @property
     def current_sound (self):
         self.update()
-        self.metadata.get('initial_uri')
+        return self.metadata.get('initial_uri') if self.metadata else {}
 
     def stream_info (self):
         """
@@ -308,15 +308,14 @@ class Dealer (Source):
         # run the diff
         if self.playlist == diff.playlist and diff.date <= now:
             self.on = True
-            for source in self.controller.source:
+            for source in self.controller.streams.values():
                 source.skip()
-
             self.controller.log(
                 source = self.id,
                 diffusion = diff,
                 date = now,
                 comment = 'trigger the scheduled diffusion to liquidsoap; '
-                          'skip all other sources',
+                          'skip all other streams',
             )
 
 
@@ -325,7 +324,7 @@ class Controller:
     station = None      # the related station
     master = None       # master source (station's source)
     dealer = None       # dealer source
-    streams = None      # streams sources
+    streams = None      # streams streams
 
     @property
     def on_air (self):
@@ -379,7 +378,7 @@ class Controller:
 
     def update_all (self):
         """
-        Fetch and update all sources metadata.
+        Fetch and update all streams metadata.
         """
         self.master.update()
         self.dealer.update()
@@ -389,26 +388,34 @@ class Controller:
     def __change_log (self, source):
         last_log = models.Log.objects.filter(
             source = source.id,
-        ).prefetch_related('sound').order('-date')
+        ).prefetch_related('sound').order_by('-date')
 
         on_air = source.current_sound
-        if on_air == last_log.sound.path:
+        if not on_air:
             return
 
+        if last_log:
+            last_log = last_log[0]
+            if last_log.sound and on_air == last_log.sound.path:
+                return
+
         self.log(
             source = source.id,
             sound = models.Sound.objects.get(path = on_air),
-            start = tz.make_aware(tz.datetime.now()),
+            date = tz.make_aware(tz.datetime.now()),
             comment = 'sound has changed'
         )
 
     def monitor (self):
         """
-        Log changes in the sources, and call dealer.monitor.
+        Log changes in the streams, and call dealer.monitor.
         """
+        if not self.connector.available and self.connector.open():
+            return
+
         self.dealer.monitor()
         self.__change_log(self.dealer)
-        for source in self.sources:
+        for source in self.streams.values():
             self.__change_log(source)
 
 
diff --git a/aircox_programs/admin.py b/aircox_programs/admin.py
index 0752043..2462788 100755
--- a/aircox_programs/admin.py
+++ b/aircox_programs/admin.py
@@ -113,6 +113,7 @@ class DiffusionAdmin (admin.ModelAdmin):
         return qs.exclude(type = Diffusion.Type['unconfirmed'])
 
 
+admin.site.register(Log)
 admin.site.register(Track)
 admin.site.register(Schedule)
 
diff --git a/aircox_programs/models.py b/aircox_programs/models.py
index 074cfd1..ffb167d 100755
--- a/aircox_programs/models.py
+++ b/aircox_programs/models.py
@@ -8,6 +8,7 @@ from django.utils.html import strip_tags
 
 from taggit.managers import TaggableManager
 
+import aircox_programs.utils as utils
 import aircox_programs.settings as settings
 
 
@@ -541,7 +542,7 @@ class Diffusion (models.Model):
         r = [ sound.duration
                 for sound in self.sounds.filter(type = Sound.Type['archive'])
                 if sound.duration ]
-        return sum(r) or self.duration
+        return utils.time_sum(r) if r else self.duration
 
     def get_archives (self):
         """
diff --git a/aircox_programs/utils.py b/aircox_programs/utils.py
index 4f99e72..9e46ea5 100644
--- a/aircox_programs/utils.py
+++ b/aircox_programs/utils.py
@@ -11,7 +11,6 @@ def to_timedelta (time):
         seconds = time.second
     )
 
-
 def seconds_to_time (seconds):
     """
     Seconds to datetime.time
@@ -20,4 +19,12 @@ def seconds_to_time (seconds):
     hours, minutes = divmod(minutes, 60)
     return datetime.time(hour = hours, minute = minutes, second = seconds)
 
+def time_sum (times):
+    """
+    Sum up a list of time elements
+    """
+    seconds = sum([ time.hour * 3600 + time.minute * 60 + time.second
+                    for time in times ])
+    return seconds_to_time(seconds)
+