The Bennett and Giuttari portative organ, Opus 46, was delivered in November, 2014, and had its first public appearance for the Messiah performances. It is currently referred to as “the portative.”
The names of the stops are:
The organ has four ranks (complete sets of pipes) but three stops. The 2’ Holtzprincipal can be taken out and the Regal put in its place. So, there are four ranks, but three can be used at one time.
The range of the keyboard is from C to d’’’ (51 keys) for a total of 153 pipes inside the organ. The interchangeable rank has another 51 pipes. The instrument is “transposing,” so it can be used for music from various eras where the “a” would have been tuned to 390, 415, 440, or 465 Hz.
The Gedeckt, Rohrflote, and Holtzprincipal are all made of wood.
The Regal is a reed stop, meaning it has a thin brass tongue that produces the sound.
The lowest pipe of the Gedeckt is about 4’ long and the body of the highest pipe of the Holtzprincipal is about 1 ½”. The larger pipes are “mitered,” meaning the body of the pipe has been cut at 45 degree angles and reglued so they take up less horizontal space. Imagine an “L” or a “J”. This is done for many of the larger pipes so they can fit inside the case.
The dimensions are 38” x 36” x 25” and the organ weighs 185 pounds. It sits on a stage dolly so it can be moved easily.