[Dx4win] No System Beep

[Larry Burke WI5A]

Posted this question a couple of weeks ago, but got no replies. Wonder if 
anyone can suggest what to look at to get my "system beep" back.... the one 
that notifies you that a new band/mode country has been spotted.  It used 
to work, then just disappeared.... not sure what I might have done to make 
it stop working.  I have "system beep" selected under "Packet 1" in 
Preferences, but no joy. Things work just fine if I select "CW announce", 
"call" (voice notification), etc. but not when "system beep" is selected. 
When it worked it used to produce a noise like "ding.wav".

Larry Wi5A