All instruments, except keyed instruments, are able to play ekmelic tones; the best are, of course, the strings and the trombones among the wind-instruments. The woodwind instruments can reach all the required microtones, partly by new, as yet unused finger positions, partly by altered pressing of the lips. Difficulties emerge with trumpets and tubes, which have available valve combinations only for some tones. But the further development of wind-instruments in order to play ekmelic tones will hardly cause unsolvable problems for the construction of instruments.