Reed pipe

This is in contrast to flue pipes, which contain no moving parts and produce sound solely through the vibration of air molecules.

The resonator may be made in a wide variety of lengths, shapes, and configurations, depending on the desired tone quality.

This method of construction projects the sound in the same manner with a vertical resonator which turns at a 90-degree angle at the top.

Volume adjustment was available to the organist by means of a balanced expression pedal which varied the wind pressure delivered to the free reed stop.

This type of free reed was popular among certain organ builders of the nineteenth century due to the increased interest in a more expressive aesthetic.

The tonal characteristics of reed pipes are determined by several factors, the most important of which is the interaction between the shallot and the tongue.

The thickness and curve of the tongue itself play an important role in determining the tonal quality of the pipe.

In addition, the type of block (whether a standard shape or a French "double-block") in which the reed assembly is set has an effect on the sound.