Hornbostel - Sachs
Sets of free reeds
Reed instruments that are free aerophones are sounded by a flow of air in which the reed is the primary vibrator. In sets of free reeds the air-stream is directed against a set of lamellae, setting them in periodic vibration to interrupt the stream intermittently. The lamellae vibrate through a closely-fitting slot. The instrument is tuned by mechanical action on the lamellae. Each reed may have a resonator in which the air vibrates only in a secondary sense, not producing the sound; generally recognizable by the absence of fingerholes. With mechanical drive.
Mechanically driven sets of free reeds