the program is not working. ill use a function generator to simulate the analog input. ill tie pin 4 high and let it run for a few seconds. then ill remove the 5V connection to pin for so when i adjust the amplitude on the function generator a sound should come out of a speaker connected to the output pin 5. but there is no sound coming out. im just wondering if any one sees any silly mistakes or has an idea to change a portion of my code