Hi Samlkh,
Kindly try using the Audio Diagnostic Tool (in the Support Tools window) -- while it's included in Little Reader's Support screen, you can access the tool from your Start menu and use it for fixing your Little Math sound problem.
You may refer to this article for instructions:
http://support.brillkids.com/entries/20433747-how-to-use-the-audio-diagnostic-toolIf you've gone through all the steps in the Audio Diagnostic Tool and you are still hearing audio issues, do write to us at support[at]brillkids[dot]com and include the following:
1. A description of the sound problem (are the words cut off, is the volume too soft / loud, is the sound completely missing, etc.)
> Do mention if you notice a similar issue when playing Little Reader lessons
2. Diagnostic Report created after you went through the Audio Diagnostic Tool
I hope this initial suggestion helps!