try

 # Enable basic debugging, do jiffies check and dump position on each period 
and hardware pointer update calls
 # Usefull when the lowlevel (specific) hardware driver is somehow broken
 echo 29 > /proc/asound/card0/pcm0p/xrun_debug


examine the system log to look for any message about the hardware pointer 


http://www.alsa-project.org/main/index.php/XRUN_Debug

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https://bugs.launchpad.net/bugs/1247719

Title:
  crackling, popping, clicking in playback to audigy2 surround51 device

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