English Translation
The successful candidates were beside themselves with joy.
TTS sounds unnatural for two reasons.
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喜びのあまり is in one phrase, and a pause is needed between あまり and 我. But TTS pronounces あまり我 as one phrase.
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TTS puts the accent on ま, the second syllable of あまり. But it means “not so much”. You need to put the accent of あ instead so that あまり in this context means “due to so much of excitement”. あまる in this sentence is derived from 余る, which means “to exceed a certain threshold”.