Leblanc also made an octocontrabass clarinet, pitched an octave below the contrabass (three octaves below the Bb soprano): I've yet to find even a recording of one. The image here is shown with a contrabass clarinet, for scale. The octocontrabass was made with range to low (really low) C, sounding Bb below the lowest note of the piano. There was apparently only one BBBb octocontrabass ever built,