It is located in a gallery above the choir stalls, on the Gospel side of the church. It is Baroque in style and was built by Guillaume d'Enoyer in 1795.
Of particular note is Aquiles Ghys's work on the instrument in 1885, when he added a second organ expressive of a romantic sound. At the same time, M. Rivero rebuilt its bellows system. However, its current state is due to the restoration carried out by Granada-born organ builder Francisco Alonso in 1987 with the support of the Granada Savings Bank.
Its neoclassical-style box features only a front facade with exposed piping, lacking any side facades. However, it does have a counter-facade that overlooks the rear room where the bellows system is located. This counter-facade has several doors that allow access to the box's interior.
The main façade we were talking about is composed of three turret-type castles that correspond to the 13th Flute register and, below these, the horizontal trumpet array arranged in two fans for the Trumpet register.
The box is richly decorated, including portraits of Charles III on the console, as well as those of Doña Luisa, Princess of Asturias, on the right side, and of Carlos Antonio, Prince of Asturias, on the left side.
At a lower level than the aforementioned trumpet tower, there are wooden covers that allow access to the wind chest.
Below, the windowed console with two manuals, the upper one for the major organ and the lower one for the expressive organ. Both keyboards originate from the composition made by Aquiles Ghys for the instrument, although their reductions are the original ones for each of the two organs.
On either side of the keyboards are rows of stop bars, including a tremolo bar that acts on the Expressive organ. On the floor, a group of chromatically arranged contrabass pedals, as well as an expression pedal for the Expressive Romantic organ.
Both keyboard and register transmission are mechanical.
As for the interior pipes, those corresponding to the main organ, which is the oldest, are arranged on the upper level of the box, while those corresponding to the Romantic organ added by Ghys are collected in two expressive boxes on either side and on a lower level.
All old bellows are preserved, as well as a more complex one mounted on a large frame. This bellows, interestingly, retains a pressure gauge indicating air pressure.
It should be noted that the instrument is operational and is being used in various liturgical celebrations.
Something very interesting about the church's ornamental aspect, and related to this organ, is the existence of a copy of the organ right in front of it, on the Epistle side of the church, and also above the choir stalls. This instrument is purely decorative, lacking any sound mechanism.