·? (drone: medium [Term not mentioned in available sources])
medium drone, retunable during playing: conical, bent, no bell, cavity? / double reed
(chromatic); With 8 or 10 closed keys.
Leydi, Roberto: La zampogna in Europa. Como, 1979, p.142.
Welch, Christopher: Lectures on the recorder. Photographic reprint, with corrections, of the first part of »Six lectures on the recorder« (1911), with a new introduction by Edgar Hunt. London, 1961, p.89.