In these days of over-amplification, it's refreshing to find Shakespeare still unplugged in the Publick Theatre's ''The Comedy of Errors," now playing in a leafy bower on the banks of the Charles. And if this is hardly the most divine ''Comedy" I've encountered, it's still a sturdy version that offers plenty of al fresco pleasure.
''The Comedy of Errors" is almost certainly Shakespeare's first comedy, which the nascent genius modeled on a farce by Plautus (also the source of Stephen Sondheim's ''A Funny Thing Happened on the Way to the Forum"). Of course the Bard added flourishes to this classic tale of twins continually mistaken for each other; he not only twinned the twins (each now has an identical servant), but threw in a romantic subplot, a shipwreck, and other contrivances that would later become his trademarks. In fact, the buds of much of the canon lie curled within the fierce little seed that's ''The Comedy of Errors."