 The instrument, with a fully mechanical transmission, has its console situated at the centre of the organ case, comprising two manuals (keyboards) each of 61 notes (Great Organ, first manual; Second Organ, second manual), with a first extensive chromatic octave and a pedal board of 24 notes.The case, with its three arched façade, presents a display of 29 pipes of the Principal 8' arranged in three groups, one for each of the three arches, with the mitred mouths of the pipes aligned.Following on, the layout of the organ is arranged according to the position of the mechanisms that control the various stops in the columns of the stops either side of the console (at the left of the console the Second Organ; at the right the Great Organ and Pedal).