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Vowel length & audio quality — TTS dataset QA

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Long vowels (marked with macrons in the transcription, shown in tan) should sound noticeably longer than their short counterparts. Listen to a speaker's sample clips, then set each feature toggle below — a speaker is complete once every toggle has a value. Progress is saved in this browser automatically — use Export CSV to write your ratings back into review.csv. Want to add or change a category? Edit the FEATURES list near the top of the script in index.html.