Sudrophone

The "valve" nearest the mouthpiece on the bell throat controls a silk membrane to create a nasal effect, which Sudre designed to make a sound like a cello or a bassoon.

Acoustically these resembled the saxhorns, but the shape was different as the main tube was doubled back on itself, giving a vertical appearance reminiscent of an ophicleide.

The unique feature of these instruments was the mirliton, a kazoo-like apparatus attached to the side of the bell with a membrane which vibrates sympathetically, creating a buzzing effect.

The device membrane can be engaged or disengaged by the player, so it can also function as a normal saxhorn-like brass instrument.

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