slow air chamber and up the ramp, through the exit hole, and into the flue. The slow air chamber can serve as a secondary resonator, which can give some flutes a distinctive sound. The sound chamber contains the sound hole, which creates the vibration of air that causes sound when the airflow reaches the splitting edge. The sound hole can also be called the whistle hole, the window, or the true sound hole ("TSH"). The splitting edge can also be called the cutting edge, the fipple edge, the labium, or the sound edge. The sound chamber also has finger holes that allows the player to change the frequency of the vibrating air. Changing the frequency of the vibration changes the pitch of the sound produced. The finger holes on a Native American flute are open, meaning that fingers of the player cover the finger hole (rather than metal levers or pads such as those on a clarinet). This use of open finger holes classifies the Native American flute as a simple system flute. Because of the use of open finger holes, the flutist must be able to reach all the finger holes on the instrument with their fingers, which can limit the size of the largest flute (and lowest pitched flute) that a given flutist can play. The finger holes can also be called the note holes, the playing holes, the tone holes, or the stops. The foot end of the flute can have direction holes. These holes affect the pitch of the flute when all the finger holes are covered. The direction holes also relate to (and derive their name from) the Four Directions of East, South, West, and North found in many Native American stories. The direction holes can also be called the tuning holes or wind holes. In addition to the Components of the Native American flute diagram shown above with English-language labels, diagrams are available with labels in Cherokee, Dutch, Esperanto, French, German, Japanese, Korean, Polish, Russian, and Spanish. Spacer plate An alternate design for the sound mechanism uses a spacer plate to create the flue. The spacer plate sits between the nest area on the body of the flute and the removable block. The spacer plate is typically held in place by the same strap that holds the block on the instrument. The splitting edge can also be incorporated into the design of the spacer