Posaune

Powerful stop, specified by John Compton on a few of his instruments. In German, the word Posaune means ‘Trombone’ or ‘Sackbut’. 

Construction:
Metal, tapered resonators of relatively narrow scale.

Tonality:
Powerful stop combining the smoothness of a Tuba with the increased ‘edge’ of a Trumpet. Narrower scale than a Tromba.