Dexter's Laboratory : Dee Dee Be Deep (1997)
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Synopsis by Emru Townsend
Dee Dee is practicing for the school choir, and her shrill singing is disturbing Dexter's work. He invents a special organ that will transform her screechy voice into a beautiful one. When Dee Dee decides to "help" by boosting the bass, she ends up with a voice deep enough to destroy furniture. (Original air date: November 5, 1997.)