·? (chanter: drone of a triple or quadruple chanter [Term not mentioned in available sources])
drone of a triple or quadruple chanter
Each of the 2 drones of the quadruple chanter.
Both contain, at their lower end, a "cross-bore" with a pierced peg, which can be turned 90° to switch them off individually.
Elschek, Oskár: Die Volksmusikinstrumente der Tschechoslowakei, 2 (Handbuch der europ. Volksmusikinstr. 1/2;2 [Slowakei]). Leipzig, 1983, p.227 (type only, no term).