Odd English transliteration in Podnos, who presents this as a synonym of Rouchalo (a "variable drone" [?]; NB: ➺ Ručalo), referring to Kachulev (Иван Качулев, »Български духови двугласни народни музикални инструменти« (1965)), but also mentions it, confusingly, in his Index I (Bagpipe names, p.115).