Sub-great bass recorder

[citation needed] It is manufactured in both bent ("knick") and square designs.

The design with a square or rectangular cross-sections was first patented in 1975 by Joachim and Herbert Paetzold.

They are made from plywood and have a doubled-back bore like a bassoon, which reduces the exterior length of the instrument.

[1] Through this special and proprietary design, the instrument can be played with a very short bocal.

[1] The sub-great bass recorder was developed by Herbert Paetzold in Ebenhofen.