My mother tongue, Korean, has no sounds for /ӕ/ and /ɑ/; ㅐ and ㅏ are a bit similar to each of them respectively. So it’s very hard to catch those sounds. Would you let me know what sound does the audio make for valuable?
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Referring to @Yes I use MUMPS comment, I'll just put my (and @StoneyB's) comments as answers.
The pronunciation is væljʊəb(ə)l. See this EL&U answer by John Lawler:
The letter æ was used in Old English to represent the vowel that's pronounced in Modern English ash, fan, happy, and last: /æ/. Mostly we now spell that vowel with the letter a, because of the Great Vowel Shift.
When æ appears in writing Modern English, it's meant to be a font variant of ae, and is pronounced the same as that sequence of vowel letters would be.
The vowel in the stressed syllable is /ӕ/. The part representing orthographic
<ua> however is not pronounced as two vowels or a diphthong (in fact practically nobody says it that way) but a single unstressed vowel—I think the reduced rounded vowel [ʊ̈].