A particular (and on theatre organs, at first sight pointless) practice is the mitering at right angles of the uppermost portion of reed pipes. Whilst originating on classical organs to prevent dust falling into unenclosed reed pipes (for example on unenclosed Great divisions) there is also a benefit to be gained in providing direction to the sound.

Click here to see an example of a hooded Orchestral Trumpet on a theatre organ. In the editor's view, the reasons for the hooded reeds remains unclear when the hooding does not actually direct the sound towards the shutters! Maybe the pipe makers could not read the layout drawings for the organ?