- written range Bb 3-F#6, sounding Ab0-E 3
- 1 octave below the bass saxophone
- additional altissimo register valve to written D 7, sounding C 4
- baritone or bass saxophone mouthpiece
- 3 automatic speaker keys
- narrow bore for less air consumption and a reasonable overall height (145 cm = 57 inches) by a completely new body design
- same fingering as any modern saxophone
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