diff --git a/src/client.cpp b/src/client.cpp
index 4e5a75dd..103b206c 100755
--- a/src/client.cpp
+++ b/src/client.cpp
@@ -39,6 +39,9 @@ CClient::CClient ( const quint16 iPortNumber ) :
     bDoAutoSockBufSize ( true ),
     iSndCrdPrefFrameSizeFactor ( FRAME_SIZE_FACTOR_DEFAULT ),
     iSndCrdFrameSizeFactor ( FRAME_SIZE_FACTOR_DEFAULT ),
+    bFraSiFactPrefSupported ( false ),
+    bFraSiFactDefSupported ( false ),
+    bFraSiFactSafeSupported ( false ),
     iCeltNumCodedBytes ( CELT_NUM_BYTES_NORMAL_QUALITY ),
     bCeltDoHighQuality ( false )
 {
@@ -375,6 +378,25 @@ void CClient::AudioCallback ( CVector<int16_t>& psData, void* arg )
 
 bool CClient::Init()
 {
+    // check if possible frame size factors are supported
+    const int iFraSizePreffered =
+        FRAME_SIZE_FACTOR_PREFERRED * SYSTEM_FRAME_SIZE_SAMPLES;
+
+    bFraSiFactPrefSupported =
+        ( Sound.Init ( iFraSizePreffered ) == iFraSizePreffered );
+
+    const int iFraSizeDefault =
+        FRAME_SIZE_FACTOR_DEFAULT * SYSTEM_FRAME_SIZE_SAMPLES;
+
+    bFraSiFactDefSupported =
+        ( Sound.Init ( iFraSizeDefault ) == iFraSizeDefault );
+
+    const int iFraSizeSafe =
+        FRAME_SIZE_FACTOR_SAFE * SYSTEM_FRAME_SIZE_SAMPLES;
+
+    bFraSiFactSafeSupported =
+        ( Sound.Init ( iFraSizeSafe ) == iFraSizeSafe );
+
     // translate block size index in actual block size
     const int iPrefMonoFrameSize =
         iSndCrdPrefFrameSizeFactor * SYSTEM_FRAME_SIZE_SAMPLES;
diff --git a/src/client.h b/src/client.h
index fb124e59..44bb2079 100755
--- a/src/client.h
+++ b/src/client.h
@@ -136,6 +136,10 @@ public:
         { return iSndCrdPrefFrameSizeFactor; }
     int GetSndCrdActualMonoBlSize() { return iMonoBlockSizeSam; }
 
+    bool GetFraSiFactPrefSupported() { return bFraSiFactPrefSupported; }
+    bool GetFraSiFactDefSupported()  { return bFraSiFactDefSupported; }
+    bool GetFraSiFactSafeSupported() { return bFraSiFactSafeSupported; }
+
     void SetRemoteChanGain ( const int iId, const double dGain )
         { Channel.SetRemoteChanGain ( iId, dGain ); }
 
@@ -188,6 +192,10 @@ protected:
     int                     iSndCrdPrefFrameSizeFactor;
     int                     iSndCrdFrameSizeFactor;
 
+    bool                    bFraSiFactPrefSupported;
+    bool                    bFraSiFactDefSupported;
+    bool                    bFraSiFactSafeSupported;
+
     int                     iMonoBlockSizeSam;
     int                     iStereoBlockSizeSam;
 
diff --git a/src/clientsettingsdlg.cpp b/src/clientsettingsdlg.cpp
index 8d068e01..ed441470 100755
--- a/src/clientsettingsdlg.cpp
+++ b/src/clientsettingsdlg.cpp
@@ -309,59 +309,29 @@ QString CClientSettingsDlg::GenSndCrdBufferDelayString ( const int iFrameSize,
 
 void CClientSettingsDlg::UpdateSoundCardFrame()
 {
-    // update slider value and text
-    const int iCurPrefFrameSizeFactor =
-        pClient->GetSndCrdPrefFrameSizeFactor();
-
+    // get current actual buffer size value
     const int iCurActualBufSize =
         pClient->GetSndCrdActualMonoBlSize();
 
-    // update radio buttons
-    switch ( iCurPrefFrameSizeFactor )
-    {
-    case FRAME_SIZE_FACTOR_PREFERRED:
-        rButBufferDelayPreferred->setChecked ( true );
-        break;
+    // set radio buttons according to current value
+    rButBufferDelayPreferred->setChecked ( iCurActualBufSize ==
+        SYSTEM_FRAME_SIZE_SAMPLES * FRAME_SIZE_FACTOR_PREFERRED );
 
-    case FRAME_SIZE_FACTOR_DEFAULT:
-        rButBufferDelayDefault->setChecked ( true );
-        break;
+    rButBufferDelayDefault->setChecked ( iCurActualBufSize ==
+        SYSTEM_FRAME_SIZE_SAMPLES * FRAME_SIZE_FACTOR_DEFAULT );
 
-    case FRAME_SIZE_FACTOR_SAFE:
-        rButBufferDelaySafe->setChecked ( true );
-        break;
-    }
+    rButBufferDelaySafe->setChecked ( iCurActualBufSize ==
+        SYSTEM_FRAME_SIZE_SAMPLES * FRAME_SIZE_FACTOR_SAFE );
 
-    // preferred size
-    const int iPrefBufSize =
-        iCurPrefFrameSizeFactor * SYSTEM_FRAME_SIZE_SAMPLES;
+    // disable radio buttons which are not supported by audio interface
+    rButBufferDelayPreferred->setEnabled (
+        pClient->GetFraSiFactPrefSupported() );
 
-    // actual size (use yellow color if different from preferred size)
-    const QString strActSizeValues =
-        GenSndCrdBufferDelayString ( iCurActualBufSize );
+    rButBufferDelayDefault->setEnabled (
+        pClient->GetFraSiFactDefSupported() );
 
-    if ( iPrefBufSize != iCurActualBufSize )
-    {
-        // yellow color if actual buffer size is not the selected one
-        // but a valid one, red color if actual buffer size is not the
-        // selected one and is not a vaild one
-        if ( ( iCurActualBufSize != ( SYSTEM_FRAME_SIZE_SAMPLES * FRAME_SIZE_FACTOR_PREFERRED ) ) &&
-             ( iCurActualBufSize != ( SYSTEM_FRAME_SIZE_SAMPLES * FRAME_SIZE_FACTOR_DEFAULT ) ) &&
-             ( iCurActualBufSize != ( SYSTEM_FRAME_SIZE_SAMPLES * FRAME_SIZE_FACTOR_SAFE ) ) )
-        {
-            TextLabelActualSndCrdBufDelay->setText ( "<b><font color=""red"">" +
-                strActSizeValues + "</font></b>" );
-        }
-        else
-        {
-            TextLabelActualSndCrdBufDelay->setText ( "<b><font color=""yellow"">" +
-                strActSizeValues + "</font></b>" );
-        }
-    }
-    else
-    {
-        TextLabelActualSndCrdBufDelay->setText ( strActSizeValues );
-    }
+    rButBufferDelaySafe->setEnabled (
+        pClient->GetFraSiFactSafeSupported() );
 }
 
 void CClientSettingsDlg::showEvent ( QShowEvent* showEvent )
diff --git a/src/clientsettingsdlgbase.ui b/src/clientsettingsdlgbase.ui
index b20d099b..05d0277c 100755
--- a/src/clientsettingsdlgbase.ui
+++ b/src/clientsettingsdlgbase.ui
@@ -245,36 +245,6 @@
            </property>
           </widget>
          </item>
-         <item>
-          <layout class="QHBoxLayout" >
-           <item>
-            <widget class="QLabel" name="TextSndCrdBufDelayActual" >
-             <property name="text" >
-              <string>Actual Value</string>
-             </property>
-            </widget>
-           </item>
-           <item>
-            <widget class="QLabel" name="TextLabelActualSndCrdBufDelay" >
-             <property name="minimumSize" >
-              <size>
-               <width>110</width>
-               <height>20</height>
-              </size>
-             </property>
-             <property name="frameShape" >
-              <enum>QFrame::Panel</enum>
-             </property>
-             <property name="frameShadow" >
-              <enum>QFrame::Sunken</enum>
-             </property>
-             <property name="text" >
-              <string>val</string>
-             </property>
-            </widget>
-           </item>
-          </layout>
-         </item>
          <item>
           <widget class="QPushButton" name="ButtonDriverSetup" >
            <property name="text" >