Thanks for the advice. I duplicated the experiment and had no trouble with the sound command. I erased the PIC several times & that didn't stop the sound command either. Must have been a bad PIC. Please help me understand something. Lately, I've been using Picstart Plus. There is an option to "erase flash device." When you click it, it erases it. On my other programmer & software, if you erase any 8 pin flash PIC's, it says "reprogramming calib byte"...then it erases...then it says "restored factory values OSCAL value &HO." Does Picstart Plus do this? Does DEFINE OSCAL_1K 1 do this? I don't really know what's going on. Thank you. - Peter