diff --git a/Jamulus.pro b/Jamulus.pro
index 9717ee71..e0eee87f 100755
--- a/Jamulus.pro
+++ b/Jamulus.pro
@@ -1,4 +1,4 @@
-VERSION = 3.3.10
+VERSION = 3.3.11cvs
 
 # use target name which does not use a captital letter at the beginning
 contains(CONFIG, "noupcasename") {
diff --git a/mac/sound.cpp b/mac/sound.cpp
index 07a4717d..5a87fec2 100755
--- a/mac/sound.cpp
+++ b/mac/sound.cpp
@@ -341,8 +341,10 @@ QString CSound::CheckDeviceCapabilities ( const int iDriverIdx )
          ( CurDevStreamFormat.mChannelsPerFrame != 2 ) ||
          ( CurDevStreamFormat.mBitsPerChannel   != 32 ) )
     {
-        return QString ( tr ( "The audio stream format for this audio device is"
-                              "not compatible with the requirements." ) );
+        return QString ( tr ( "The audio stream format for this audio device is "
+                              "not compatible with the requirements. Maybe the "
+                              "number of channels is incompatible, e.g., if the "
+                              "device only is mono." ) );
     }
 
 // TODO     mSampleRate, mFormatFlags      = kAudioFormatFlagIsSignedInteger