The Double String Unison (DSU) Tuning Technique is a way of tuning piano notes that allows the technician to make very small and precise pitch changes, much smaller than can be done with single strings.

It also forces the technician to improve their ability to quickly set solid unisons, and once they have mastered that, the technique becomes very efficient, allowing technicians to make small, precise, and stable pitch changes to two strings at once.

Below are the lessons that will show you how the technique works and will allow you to practice the technique using recordings of actual piano strings.

DSU Lessons

Introduction - FREE
Exercise - Test Your Pitch Sensitivity - FREE
Exercise - Train Your Ear to Hear Different Out of Tune DSU
Exercise - DSU Practice - Level 1
Exercise - DSU Practice - Level 4
Exercise - DSU Practice - Level 4b
Lesson - Beat Matching Example - FREE
Lesson - Tuning A4 Using an ETD and DSU
Exercise - Tune A4 Using an ETD and DSU

Documents:
DSU Procedure - FREE