Aha! Straight from the horse's mouth:
http://www.house.gov/rules/98-228.htm
http://www.ddal.org/howbill.html
A voice vote isn't even COUNTED. A member must call for counting to happen. For votes to be recorded (and I guess attributed to a specific member) more formalities take place. I guess no one bothered for DMCA...
I wonder how the Texas folks will vote on this one...
http://thefacts.com/story.lasso?wcd=9070