The Workbook is comprised of twenty organ trios in double counterpoint…complete with detailed finger and pedal markings, and provides a graduated course to help the adventuresome pianist master the initial difficulty of coordinating Manual and Pedal interplay.  Accessible online https://www.wolfgangrubsam.com/tunes-workbook, the musical elements are introduced by an extensive foreword, and a MIDI audio option is available, too, for comparative evaluation.