Dyads

Dyads (dual sounds)

Dyads are two-part multiphonics. They demand and develop particularly sensitive embouchure, lip pressure, and shaping and modification of the oral cavity through the position and shape of the tongue. At the same time, jaw position, airflow, and breath support must be carefully adjusted. Dyads can only be played in a piano dynamic.

A fingering chart compiled by Heather Roche can be found at this link.