Contrabass versions exist for almost every instrument now. Most of the newer instruments are scarcely written for and are mainly used in new music. There are a few newer companies making wind instruments that can go lower and lower. Eppelsheim makes my contraforte, as well as a very well received contrabass clarinet, tubax, and contrabass sax. Hogenhuis is popular making contrabass flutes.
Kristopher King 