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Here's one more response to my newsgroup post:

Date: Mon, 12 Jun 1995 17:12:36 -0400
From: Yuqian Lou <[log in to unmask]>
Subject: Re: Is barley amylase used in liquor production?
Newsgroups: sci.bio.food-science

Barley amylase is certainly used in beer production. For other alcoholic
beverages that use cereals as ingredients, the sources of amylases may be
barley, wheat, rice, bacteria, or fungi. For more details, you can refer to
any fermentation books about alchohol or alcholic beverages.