Chickenman instructions 2

I am trying to convert the audio to ac3 and when I use ac3 machine, the input file is and encoded mpeg and the output is an extracted ac3. Is this right? According to the instructions the output should also be encoded not extracted?
The input file is an encoded mp3 and the output is an extracted ac3 file.
What do i need to do now?

Do I need to download and install BeSweet?