 Tromba dolce 8'
Voce tremula 8' Treble
Viola I 4' Bass
Violin I 4' Treble
Viola II 4' Bass
Violin II 4' Treble
Voce flebile Treble
Flute in VIII 4'

Bassoon Bass
Trumpet Treble 
Clarion Bass
Clarinet Treble
Trumpet Bass
English horn Treble
Contra Oboe Treble
Contra Oboe Bass
Flute Treble
Viola Bass
Flute in VIII Bass
Flute in VIII Treble
Piccolo Treble
Open twelfth Treble
Principal cornet Treble
Vox humana Treble
Violine 8' (on the pedals)
Kettledrum (on the pedals)
Bombarde 16' (on the pedals)

Principal 16' Bass
Principal 16' Treble
Principal I 8' Bass
Principal I 8' Treble
Principal II 8' Bass
Principal II 8' Treble
Octave 4' Bass
Octave 4' Treble
Open twelfth 2⅔' Bass
Open twelfth 2⅔' Treble
Super octave 2'
Octave twelfth 1½'
Octave fifteenth 1'
Mixture I
Mixture II
Mixture III
Bass viols and octave 16'+8' (on the pedals
Bass viols II 16' (on the pedals)
Coupler IP
Coupler II-I
Third hand

Other chapels were added to the original edifice.Notable is the octagonal Capella di Sant'Aquilino (chapel of St Aquilino), adjoining the main church to the south.The chapel, which may have originally been built as an imperial Roman mausoleum, features important 4th-century Paleochristian mosaics.