David:

Thanks for the suggestion.  Forgive my lack of understanding of speaker
electronics but I don't understand a couple of things...maybe you can
help.

Your Suggested pseudo-code:
>>Beep
>>        Turn_On_Speaker_Bit
>>         Delay
>>         Turn_Off_Speaker_Bit
>>         Delay
>>         Goto Beep

I can't use a piezo buzzer of PC-speaker as you suggested.  I actually
NEED to use a small headphone.  The reason for this is that I need a user
to audibly detect an discreet event being monitored by my PIC.  The device
will be used in a high noise (loud auditory) enviroment.  They aren't
always looking at the led indicator which blinks, and can't hear something
on the device.

Using you suggestion, how do I adjust volume, and tone on a set of
headphone speaker(s)?

Thanks,

Scott