some call it a trick and some call it a illusion.. THE DUCT TAPE MOUTH is a trick but it can become a illusion depending on the Ventriloquist skills with lip control. Ventriloquist jay Johnson in demo above ☝️ how I do the duct tape mouth illusion... I gently cover the center..(center) of my mouth with duct tape pretending to press down with a little bit of force, acting skills needed, next I secretly blow air out my mouth, the air will make a gap hole between the tape and my lips, this gap hole will provide for a opening so sound can escape out...I breathe in through my nose and exhale out my mouth with sound and slowly air together, breathing control skills are needed, the Ventriloquist character will provide misdirection from what? from my breathing control, yes in this trick it's basically breathing control the rest is just the same as lip control or speaking with out moving your lips..I usually don't use this trick for Ventriloquism dialogue with the Ventril...