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NOTE: Please use headphones.
With SpeechJammer, you can literally "jam" someone's voice. Through the Delayed Auditory Feedback effect, the speaker will have trouble articulating while speaking, effectively inhibiting his or her speech!
To put it briefly, the effect occurs when you hear your own voice at a slight delay. Many people tend to start mumbling, and therefore "jamming" speech. Works best if you try to read something!