grips the valve section with the left hand, which supports the weight of the instrument while the right arm is free to operate the slide. The James Morrison Schagerl model has the two sections of a normal tenor trombone (slide and bell), with three rotary valves and their tubing incorporated in the bell section in a similar manner to F attachments. Early superbones, and the Holton instrument designed for Ferguson (who was primarily a trumpet player), have very narrow almost trumpet-like bore diameters of less than . Later models from Schagerl and Wessex use a larger bore of found more commonly on modern tenor trombones. Technique The Superbone can be played as a slide trombone, a valve trombone, or in combination. Using the slide and valves in combination requires the slide positions to be adjusted, just as when using the trigger of an F attachment on a tenor or bass trombone. Using the slide with the first and third valves engaged has the same effect as using an F attachment. Conversely, the valves can be used to provide trills and ornaments for passages played with the slide. See also Firebird, a trumpet with both valves and slide. Valide trombone, a similar instrument with a shorter slide of four positions. References Bibliography Trombones Continuous pitch instruments B-flat instruments