When using my voice it's just a matter of lots of practice; so how do I myself produce a honk or double cluck etc. Let's see if I can explain this as easy as possible.
When you go into a hunting store and you see a new product and get excited you might say "Ooooo look at this", it's the "Ooooo" that you need for part one; the second half of the call to complete it the word closest to the honk is "wok" but I add an extra "o"; "wook". Just like saying "wookie" but with no "ie" at the end.
So you start with "Ooooo" and end with "wook". The "Ooooo" needs to start off high(not a high pitch)and swing low and back to the high, like a child on a swing, they start high swing low and then high. Once you come back to high, push a quick "wook" that needs to be louder or twice as loud as the "Ooooo" You can lengthen the "Ooooo" longer or shorter.
You need to do this from your diaphragm and it needs to be loud, "Oooooo wook"
A double cluck is faster and can vary with a short "Ooo" a fast "wook" and a even faster "wook" right after: "Ooo" "wook" "wook"
or two quick "wook"s one right after another, I also add low growl in between etc. "wook" growl "wook" but it needs to be quick
Hope this helps explain how I call geese using my voice without a goose call, everyone does it in their own way and like everything else it takes a lot of practice.