I'm not aware of a cadence when writing, but I hear it after. I write in longhand, and that helps. You're closer to it, and you have to cross things out. You put a line through it, but it's still there. You might need it. When you erase a line on a computer, it's gone forever.
Writing screenplays is not my business. I've written half a dozen, and maybe half of those were made. But it was never a satisfying experience. It was just work. You're an employee. You would be told what to do. Studio execs would cross out my dialogue and put in their dialogue.