The sound you’re looking for is called “Canadian rising”. The sound americans hear as “oot” (as in “aboot the hoose”) really consists of a single pure vowell where most american dialects have a dipthong.
You say “about” with a dipthong–the ~out part comes out something like ow-oat, or maybe ow-oot. Canadians stay on the initial vowell all the way to the T. I don’t know why americans hear this as “oot”; to my ears, we start on the same sound you do, and ride it to the end of the word.