Tuning an accordion cannot be viewed in isolation from the relevant physical and technical influences. This publication places the various aspects in an overall context. Starting with the tone generation of the accordion, the basic principles of tuning, such as pitch, tone frequency, and tempered tuning, are presented. The accordion's beaten tone series in particular is analyzed in detail. The beat frequencies and thus the sound effects of the beaten tones vary considerably between individual accordion instruments. The beaten tone tunings, from flat beats to musette beats, are discussed in detail. The resulting beat frequency characteristics are interpreted mathematically. Calculation strategies are developed, and abbreviations are introduced. Only this completely new way of presenting beaten tone tuning allows a direct, objective comparison of the beaten tone tunings of different instruments. A further section discusses how to restore the tuning of an accordion to its original sound, eliminating any previous tuning errors. The necessary pitch measurements and calculations are presented and illustrated with examples. Furthermore, it is possible to create your own customized sound.
 In addition to the necessary skills, practical tuning requires knowledge of the various ways in which the accordion's pitch can be influenced. Since playing pressure changes the pitch, especially in the lower voices, this phenomenon cannot be without impact on tuning. It will be shown that the reed valves and the dimensions of the comb and tone hole also influence pitch.
 A short tuning guide with a description of the preparatory work, the tools and equipment, pitch correction, working on the tuning table and tuning the treble and bass parts shows how a clean basic tuning can be achieved and how a suspended tone series is tuned.
 A table section and a compilation of the calculation formulas used follow.
 This textbook is aimed at accordion makers, accordion tuners, service professionals, musicologists, accordion teachers, students, interested parties, accordion players and anyone who is interested in comprehensive information about the tuning of accordion instruments.
 Technical and physical principles, mathematical analysis of the suspended concrete series, suspended concrete calculation, practical tuning instructions, 100 pages, 23 illustrations, 19 tables, DIN A4 format, paperback, 3rd edition 2003 (1st edition 1989), ISBN 3-00-002632-0