Korean · Pronunciation Guide
deut-tta. The vowel is the lip-spread ㅡ, the ㄷ batchim closes unreleased, and the final ㄷ tenses into ㄸ.
deutda
A pair of syllables and a held closure. This is a ㄷ-irregular verb, which matters for pronunciation as much as for grammar: in front of a vowel ending, the stem consonant becomes ㄹ, so 듣다 turns into 들어요 and the whole shape of the word changes.
Listen: 듣다
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라디오를 들어요.
Radioreul deureoyo.
I listen to the radio.
Listen: 라디오를 들어요.
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라디오를 들어요 shows that irregularity working -- the stem ㄷ has become ㄹ and then resyllabified into the vowel, so what you actually hear is deu-reo-yo, with a tap where a stop used to be. Nothing in the dictionary form predicts that r.
The vowel is the first problem: 'doot-da' with rounded lips is wrong, because ㅡ needs the lips flat and the tongue high and back. The second is releasing the middle t and softening the final one, producing 'deut-duh' -- Korean wants silence in the middle and a tight, throat-squeezed ㄸ at the end.