It depends on what "analyze" means.
In LV 6 you have some helpful functions for managing audio I/O (located in Functions > Graphic & Sound > Sound palette).
If you are thinking on something complex (like speech recognition), check this post [http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=506500000008000000F8350000&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0]
Hope this helps.