John Weeks Moore, Complete Encyclopaedia of Music… (1880)
“ An improvement has been at-tempted, by adapting three or four keys, like flute keys, on one of the drones ; by pressing I one of them with the arm, a third or fifth to the note of the chanter is produced, which forms an intermediate chord with the drone, and has a pleasing effect. The second kind of this instrument is the Scottish or Highland bagpipe, which is played either with the mouth or with bellows, like the Irish pipe ; and, excepting that, as far as we know, keys have never been adapted to it, is almost the same in every respect. ”
