FightNome aligns recorded voice callouts to the beat in its boxing training app

The developers of FightNome, a boxing training app, describe how it calls out strikes aloud while users shadowbox or work pads. Workouts run from 74 to 128 BPM, and the music is a single track time-stretched to match each tempo so the beat grid stays in sync. Each callout is a separate recording of a real voice saying one word, and each one starts 40 to 60 ms early so the word lands on the beat. The app has two modes, combo mode that repeats user-built sequences and reaction mode that picks random words at 6 to 45 calls a minute. The post notes that output latency varies across phone speakers, wired earbuds and Bluetooth headphones, so a fixed head start is only a compromise.
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