The attached audio file is a voice that counts down: 3 - 2 - 1. Download the file to your computer by RIGHT CLICKING on the link, then use the option "Save link as ...", or "Save target as ...." (different browsers will say the same thing in different words.)
Edit the sound wave to say 1 - 2 - 3. Save the new file as 123.aup. Export the file to the Windows WAV format, and upload your finished file here.