diff -ur moc-2.5.0-alpha4_orig/decoder_plugins/sidplay2/sidplay2.cc moc-2.5.0-alpha4/decoder_plugins/sidplay2/sidplay2.cc
--- moc-2.5.0-alpha4_orig/decoder_plugins/sidplay2/sidplay2.cc	2007-06-16 13:22:18.000000000 +0200
+++ moc-2.5.0-alpha4/decoder_plugins/sidplay2/sidplay2.cc	2010-09-28 19:25:18.000000000 +0200
@@ -34,6 +34,23 @@
 
 static int playSubTunes;
 
+namespace
+{
+  int get_current_subtune_begin_time(sidplay2_data *data)
+  {
+    if(data->currentSong == data->timeStart)
+      return 0;
+
+    return data->subtune_end_times[data->currentSong-2];
+  }
+
+  int get_current_subtune_length(sidplay2_data *data)
+  {
+    return data->subtune_end_times[data->currentSong-1]
+      - get_current_subtune_begin_time(data);
+  }
+}
+
 static sidplay2_data * make_data()
 {
   pthread_mutex_lock(&player_select_mutex);
@@ -240,7 +257,7 @@
   
   s2d->songs = st->getInfo().songs;
 
-  s2d->sublengths = new int [s2d->songs];
+  s2d->subtune_end_times = new int [s2d->songs];
 
   s2d->startSong = st->getInfo().startSong;
 
@@ -276,12 +293,12 @@
         dl = minLength;
       
       s2d->length += dl;
-      s2d->sublengths[s-1] = dl;
+      s2d->subtune_end_times[s-1] = s2d->length;
     }
     else
     {
       s2d->length += defaultLength;
-      s2d->sublengths[s-1] = defaultLength;
+      s2d->subtune_end_times[s-1] = s2d->length;
     }
   }
 
@@ -324,8 +341,8 @@
   if(data->tune!=NULL)
     delete data->tune;
 
-  if(data->sublengths!=NULL)
-    delete data->sublengths;
+  if(data->subtune_end_times!=NULL)
+    delete data->subtune_end_times;
 
   free(data);
 }
@@ -435,9 +452,20 @@
  * generic seeking can't be done because the tune has to
  * be played until the position (needs CPU)...
  * */
-extern "C" int sidplay2_seek (void *void_data ATTR_UNUSED, int sec ATTR_UNUSED)
+extern "C" int sidplay2_seek (void *void_data, int sec)
 {
-  return -1;
+  struct sidplay2_data *data = (struct sidplay2_data *)void_data;
+
+  if (data->currentSong >= data->timeEnd)
+  {
+    return -1;
+  }
+
+  data->player->stop();
+  data->currentSong++;
+  data->tune->selectSong(data->currentSong);
+  data->player->load(data->tune);
+  return get_current_subtune_begin_time(data);
 }
 
 extern "C" int sidplay2_decode (void *void_data, char *buf, int buf_len,
@@ -447,7 +475,7 @@
 
   int seconds = data->player->time() / data->player->timebase();
 
-  int currentLength = data->sublengths[data->currentSong-1];
+  int currentLength = get_current_subtune_length(data);
 
   if(seconds >= currentLength)
   {
@@ -458,9 +486,6 @@
     data->currentSong++;
     data->tune->selectSong(data->currentSong);
     data->player->load(data->tune);
-  
-    currentLength = data->sublengths[data->currentSong-1];
-    seconds = 0;
   }
     
   sound_params->channels = data->channels;
diff -ur moc-2.5.0-alpha4_orig/decoder_plugins/sidplay2/sidplay2.h moc-2.5.0-alpha4/decoder_plugins/sidplay2/sidplay2.h
--- moc-2.5.0-alpha4_orig/decoder_plugins/sidplay2/sidplay2.h	2007-04-02 22:00:32.000000000 +0200
+++ moc-2.5.0-alpha4/decoder_plugins/sidplay2/sidplay2.h	2010-09-28 19:25:18.000000000 +0200
@@ -67,7 +67,7 @@
   sid2_config_t cfg;
   ReSIDBuilder *builder;
   int length;
-  int *sublengths;
+  int *subtune_end_times;
   int songs;
   int startSong;
   int currentSong;