Read a well-written newsletter out loud and you will hear the problem immediately. Sentences with three subordinate clauses. Parentheticals. Lists that made sense as bullets and turn to mush as speech. The eye can re-scan; the ear gets one pass.
Radio writers solved this decades ago, and their rules are almost embarrassingly simple. One idea per sentence. Verbs early. Names before pronouns. Say numbers the way a person says them. Signal every turn: 'meanwhile', 'the catch is', 'here is why that matters'. The listener should always know where they are without seeing the map.
Teaching the composer
Our composition prompt reads like a radio style guide because it mostly is one. The model plans a rundown first, the way a producer would, then writes each chapter as a spoken segment with an angle, not a summary. We reject drafts that read like articles: too many clauses, headline-speak, anything a voice would stumble on.
Then the voice does its half. Modern synthesis honors punctuation the way an announcer honors a script's markings, so the writing and the reading are designed together. A comma is a breath. A short sentence is emphasis. A question wakes the listener up.
The ten-minute discipline
The hardest instruction to enforce is length. Models, like junior producers, want to include everything. But the entire promise of a brief is the edit: ten minutes that respect you enough to end. So the budget is enforced in the contract, chapters have word targets, and the composer learns the oldest lesson in broadcasting: leave them wanting slightly more, at exactly the same time tomorrow.
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