The pitch of the tone produced is a function of the volume of air contained within the body of the pipe.
Long pipes produce low pitched tones, whereas short pipes produce high pitched tones.
The frequency of the oscillation of the wind sheet at the mouth of the pipe is directly proportional to the mass of the still air contained within the pipe. Changing the width and depth of the pipe changes the strength of the tone. A pipe with a long slender body is relatively soft-toned when compared to a larger pipe of similar length. A discussion on types of pipes, including graphics will eventually be added to the end of this document.