✅ Geometry – How do we measure? Why is geometry essential in general and for PTD? Practical examples and insights.

✅ English & Viennese Actions – What can we do with PTD in these actions? A historical and modern perspective. Blüthner Patent Action.

✅ PTD in Upright Pianos & KAMM Action – Discover a very special result! Shown on a Rippen Maestro Upright.