diff --git a/ChangeLog b/ChangeLog
index 81bfffe5..2fb12807 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,20 +1,26 @@
 
 
 
-3.4.8git
+3.5.0git
+
+  * added support for 64 samples OPUS packets in the client (if a sound card buffer size
+    larger or equal than 128 samples is chosen, the legacy 128 samples OPUS packets are used)
 
   * refresh server list if the Central Server address type is changed
 
   * bug fix: the server welcome message may appear twice if the server list was double clicked
 
 
-TODO client: larger sound card buffers are managed by conversion buffer, not in processintern for loop (note iSndCrdFrameSizeFactor!)
-             maybe let the use select all possible sound card buffer sizes, this should solve Ticket #53
+TODO check for audio fade in time at the server with newest version -> is it still correct?
 
 TODO mixer faders linear -> log gain is better: CalcFaderGain() -> x = -50:1:0; plot(x, (10 .^ (x / 10)))
 
 TODO offer the Jamulus ASIO settingspanel in case of an ASIO ERROR to fix, e.g., incorrect sample rate (https://sourceforge.net/p/llcon/discussion/533517/thread/777663cf94/#035f)
 
+TODO issue with Mac audio interface: https://sourceforge.net/p/llcon/discussion/software/thread/7c443f2ed9/#eeab
+
+TODO let the user select all possible sound card buffer sizes, this should solve Ticket #53
+
 TODO auto jitter buffer performance not good at 64 samples frame size -> to be checked again
 
 TODO for different frame sizes (64/128) the start value of 6 for the jitter buffer might be too low
diff --git a/Jamulus.pro b/Jamulus.pro
index f730ec1b..44c0485e 100755
--- a/Jamulus.pro
+++ b/Jamulus.pro
@@ -1,4 +1,4 @@
-VERSION = 3.4.8git
+VERSION = 3.5.0git
 
 # use target name which does not use a captital letter at the beginning
 contains(CONFIG, "noupcasename") {
diff --git a/src/client.cpp b/src/client.cpp
index 53642b62..8e452374 100755
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -1146,12 +1146,15 @@ fflush(pFileDelay);
 
 int CClient::EstimatedOverallDelay ( const int iPingTimeMs )
 {
+    const double dSystemBlockDurationMs = static_cast<double> ( iOPUSFrameSizeSamples ) /
+        SYSTEM_SAMPLE_RATE_HZ * 1000;
+
     // If the jitter buffers are set effectively, i.e. they are exactly the
     // size of the network jitter, then the delay of the buffer is the buffer
     // length. Since that is usually not the case but the buffers are usually
     // a bit larger than necessary, we introduce some factor for compensation.
     // Consider the jitter buffer on the client and on the server side, too.
-    const double dTotalJitterBufferDelayMs = SYSTEM_BLOCK_DURATION_MS_FLOAT *
+    const double dTotalJitterBufferDelayMs = dSystemBlockDurationMs *
         static_cast<double> ( GetSockBufNumFrames() +
                               GetServerSockBufNumFrames() ) * 0.7;
 
@@ -1187,9 +1190,8 @@ int CClient::EstimatedOverallDelay ( const int iPingTimeMs )
     const double dDelayToFillNetworkPacketsMs =
         GetSystemMonoBlSize() * 1000 / SYSTEM_SAMPLE_RATE_HZ;
 
-    // CELT additional delay at small frame sizes is half a frame size
-    const double dAdditionalAudioCodecDelayMs =
-        SYSTEM_BLOCK_DURATION_MS_FLOAT / 2;
+    // OPUS additional delay at small frame sizes is half a frame size
+    const double dAdditionalAudioCodecDelayMs = dSystemBlockDurationMs / 2;
 
     const double dTotalBufferDelayMs =
         dDelayToFillNetworkPacketsMs +
diff --git a/src/serverdlg.cpp b/src/serverdlg.cpp
index 83de9f1a..04564e3d 100755
--- a/src/serverdlg.cpp
+++ b/src/serverdlg.cpp
@@ -163,7 +163,7 @@ CServerDlg::CServerDlg ( CServer*        pNServP,
 
     // set up list view for connected clients
     lvwClients->setColumnWidth ( 0, 170 );
-    lvwClients->setColumnWidth ( 1, 130 );
+    lvwClients->setColumnWidth ( 1, 200 );
     lvwClients->clear();
 
 
@@ -175,6 +175,7 @@ lvwClients->setMinimumHeight ( 140 );
     // insert items in reverse order because in Windows all of them are
     // always visible -> put first item on the top
     vecpListViewItems.Init ( MAX_NUM_CHANNELS );
+
     for ( int i = MAX_NUM_CHANNELS - 1; i >= 0; i-- )
     {
         vecpListViewItems[i] = new QTreeWidgetItem ( lvwClients );
@@ -488,12 +489,6 @@ void CServerDlg::OnTimer()
                 vecpListViewItems[i]->setText ( 2,
                     QString().setNum ( veciJitBufNumFrames[i] ) );
 
-                // out network block size
-                vecpListViewItems[i]->setText ( 3,
-                    QString().setNum ( static_cast<double> (
-                    veciNetwFrameSizeFact[i] * SYSTEM_BLOCK_DURATION_MS_FLOAT
-                    ), 'f', 2 ) );
-
                 vecpListViewItems[i]->setHidden ( false );
             }
             else
diff --git a/src/serverdlgbase.ui b/src/serverdlgbase.ui
index aecd954e..aebc5b3a 100755
--- a/src/serverdlgbase.ui
+++ b/src/serverdlgbase.ui
@@ -26,6 +26,9 @@
      <property name="rootIsDecorated">
       <bool>false</bool>
      </property>
+     <property name="columnCount">
+      <number>3</number>
+     </property>
      <column>
       <property name="text">
        <string>Client IP:Port</string>
@@ -41,11 +44,6 @@
        <string>Jitter Buffer Size</string>
       </property>
      </column>
-     <column>
-      <property name="text">
-       <string>Block Size Out/ms</string>
-      </property>
-     </column>
     </widget>
    </item>
    <item>