Jason Shavey from Synergy Productions discusses the Furman monitor system used when you track vocals at Synergy.

Jaime Vendera, member of The TC-Helicon Voice Council, founder of www.thevoiceconnection.com and author of "Raise Your Voice", breaks glass acoustically with his voice.

This is not a special effect. The human voice really can break glass, provided that you calibrate for the proper frequency and decibel levels.