Sound upon the big reveal

• "Brilliant, ain't I?!"
• Exclamation that might accompany a curtsy
• Showstopping call
• Cry of unveiling
• "And there it is!"
• "Wasn't that fantastic?!"
• Dramatic entrance announcement
• Magician's word
• "I made a chocolate soufflé!"

Wiktionary Word definitions in Wiktionary
interj. (alternative spelling of ta-da English)