Japanese · Pronunciation Guide
ze-n-i-n, four beats — the apostrophe in "zen'in" warns you that the ん and the i are separate.
zen'in
Four slots, half of them nasal. This word is the classic demonstration of why Japanese romanisation needs an apostrophe: without it, zenin would read as ze-ni-n, three beats, a completely different rhythm. Keep the nasal and the following vowel apart and the four-count survives.
Listen: 全員
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全員が集まりました。
Zen'in ga atsumarimashita.
Everyone has gathered.
Listen: 全員が集まりました。
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全員が集まりました follows with 集まりました, six morae including a tap and a devoicing-prone shi at the end. So the sentence opens with two nasal beats in four morae and then runs six mostly-voiced ones — a long line where the temptation to compress the opening is strong.
The instinct is "ZEN-in" in two syllables, or worse, "ze-NEEN" with the nasal absorbed into the following vowel. Both drop beats. Hum the first ん to completion, then start the i cleanly — a tiny break helps at first — and finish on a second full beat of nasal.