90-key Carl Frei Street Organ Scale

Section Notes Specification
Melody 23 keys 2 ranks each bourdon, violin, celeste; 1 rank piccolo
Accompaniment 19 keys 2 ranks open/stopped flutes
Bass 8 keys 1 rank each stopped, quint, cello + trombone
Counter-Melody 18 keys 2 ranks each bifoon, unda maris; 1 rank cello
Tremulants 2 keys 1 each for melody & counter-melody
Percussion 3 keys bass drum & cymbal + snare drum
Registers 8 keys Various - see list
unused 8 keys Various - see list
Mute 1 key Silences entire organ (actuates on opening keyframe)