Choose the job before the personality
A commentary voice can describe live action, explain a replay, deliver an accessible audio description or summarise a completed passage. These jobs require different levels of detail. A visual audience may not need a running account of every pass. A listener without the picture may need position, direction and ball movement before any tactical interpretation. Define the audience's information needs before choosing warmth, excitement or pace.
For an assistant that supplies text to a human commentator, the safest output is often a compact fact rather than a polished line. It allows the broadcaster to retain their own voice and integrate the information naturally. A fully scripted suggestion can encourage repetition and make an uncertain claim sound ready for publication.
Let the sport set the rhythm
Tennis has discrete points, service changes and an established scoring vocabulary. A workflow supporting ITF, ATP or WTA coverage needs the correct competition context rather than a generic racket-sport template. Short prompts can fit between points; a long background passage can collide with the next serve.
Football is more continuous. An apparently quiet exchange may develop into a chance before a generated sentence ends. In basketball, possession and shot-clock pressure change the useful length of a line again. Templates should express these differences explicitly instead of relying on a model to improvise the pacing.
Write from evidence outward
Separate a factual core from optional interpretation. “The team has changed its left-sided defender” is a different claim from “the coach wants to protect the lead.” The first may be supported by a substitution record; the second attributes intent. A responsible assistant can offer the observable change and, where appropriate, frame tactical analysis as a possibility rather than a discovered fact.
Avoid emotional or medical inference from appearances. A player looking down does not establish despair. A slow walk does not establish an injury diagnosis. The temptation to turn small gestures into a complete human story is particularly strong in generated language because the resulting sentence sounds familiar. Familiarity is not evidence.
Build a pronunciation workflow
Names need preparation, not guesswork during the match. Maintain a checked pronunciation list with the player's preferred form where available, a source and a revision date. Review team names, venues and officials as well as the starting line-up. An unexpected substitute should not be the first time a production encounters a name.
Text-to-speech systems may support pronunciation dictionaries or phoneme controls, but the details vary. Test the actual engine, language and speaking style used in production. A name pronounced correctly in isolation can change when embedded in a fast sentence. Keep display text and spoken rendering separate so that a pronunciation workaround does not corrupt captions or archived records.
Do not flatten the differences
Cricket leaves spaces between deliveries, but the correct explanation depends on format, field restrictions and the state of the innings. Rugby coverage under World Rugby laws uses terms whose meaning differs from football. World Athletics events bring heats, qualification rules and timing conventions that do not map neatly onto a team-sport possession model.
Audience knowledge matters too. A specialist feed can use shorthand that would exclude a newcomer. Keep a declared audience profile and test whether the commentary explains enough without becoming a glossary read aloud.
Use repetition as a diagnostic
If every chance is “crucial” and every late score is “dramatic,” the language has stopped distinguishing events. Review repeated adjectives, sentence openings and narrative claims over a complete match, not just a short demonstration. Check whether the system invents momentum from a sequence of unrelated events or overstates historical significance without a verified comparison set.
Allow explicit silence. A generated voice does not need to justify its existence by talking continuously. Crowd sound, a referee's announcement and a human commentator's pause can all carry information. Set interruption rules so that an optional background line cannot speak over a decision or a decisive action.
Desk caveat: natural speech can disguise weak sourcing
A realistic voice can make an unsupported statement feel authoritative. Review the evidence behind the script independently of the audio quality, and make uncertainty audible when it matters.
Handle voice rights and disclosure
A convincing imitation is not permission to use a person's voice. Obtain appropriate rights and consent for voice assets, and check the permitted contexts, duration and withdrawal arrangements. The terms for a stock synthetic voice may differ from those for a custom model. Do not assume that a recording cleared for one production also permits model training.
Tell the audience when commentary is automated or materially generated where that is relevant to their understanding, and check any applicable legal or platform requirements. An accessible text alternative should reflect the information actually delivered, including meaningful corrections. Voice design becomes trustworthy when the production can explain what was generated, what was checked and who remained responsible for the final call.
Next: keep the call honest