S1U1B3B3A1S1S1
11 points
SUBBASS is validvalid
a pedal stop producing the lowest tones of an organ [n SUBBASSES]
a pedal stop producing the lowest tones of an organ [n -ES]
a pedal stop producing the lowest tones of an organ [n SUBBASSES]
a pedal stop producing the lowest tones of an organ [n -ES]