diff --git a/ChangeLog b/ChangeLog
index 76d3aeff..a5fec4c8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -15,11 +15,9 @@
   * bug fix: the server welcome message may appear twice if the server list was double clicked
 
 
-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 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 auto jitter buffer performance not good at 64 samples frame size -> to be checked again
diff --git a/src/global.h b/src/global.h
index c509722b..45bc4781 100755
--- a/src/global.h
+++ b/src/global.h
@@ -100,7 +100,6 @@ LED bar:      lbr
 // Note that the UpdateAutoSetting() function assumes a value of 128.
 #define SYSTEM_FRAME_SIZE_SAMPLES_SMALL  64 // TODO this is temporary and shall be replaced by SYSTEM_FRAME_SIZE_SAMPLES later on
 #define DOUBLE_SYSTEM_FRAME_SIZE_SAMPLES ( 2 * SYSTEM_FRAME_SIZE_SAMPLES_SMALL )
-#define SYSTEM_FRAME_SIZE_SAMPLES        128
 
 // default server address
 #define DEFAULT_SERVER_ADDRESS          "jamulus.fischvolk.de"
@@ -122,10 +121,6 @@ LED bar:      lbr
 // system sample rate (the sound card and audio coder works on this sample rate)
 #define SYSTEM_SAMPLE_RATE_HZ           48000 // Hz
 
-#define SYSTEM_BLOCK_DURATION_MS_FLOAT  \
-    ( static_cast<double> ( SYSTEM_FRAME_SIZE_SAMPLES ) / \
-    SYSTEM_SAMPLE_RATE_HZ * 1000 )
-
 // define the allowed audio frame size factors (since the
 // "SYSTEM_FRAME_SIZE_SAMPLES" is quite small, it may be that on some
 // computers a larger value is required)