Still no luck with the decay - new s/w and pic of RA3/RA4 results http://home.clear.net.nz/pages/joecolquitt/davedong.html Do you have a practical example ? If nothing else at least I've got another IRQ-based beep routine -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.