This would best be executed as something half way betwixt 'ahh' and 'uh'. The object is to fix your vowel quality and keep it pure and well supported by breath throughout its duration. Singing forward with a low tongue and forward facial mask, and steady breath support will aid in making a beautiful vowel out of 'shu-u-u-u-un'....'shu-u-u-u-un'...
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