What causes a chirp?

Thanks davehrab.
I'm with you ncarv-
"just one more time Alice"
Thanks reubent. I realize you men voiceboil..

Well tks matt,; and asvjerry - I like that. As little Johnny says "It shows you're thinking".
Davehrab I appreciate your comments and will explore your links.
Cheers; it's time for some B&B. Bach and Brandy...

Thanks to allI found the cause of the chirp-
It was the sound of all the "birds" promoting the
SR Red and Black "Quantum"  fuses, non sense..