When going through pipe organ specifications (such as this one), I came across a peculiar nomenclature for manual / pedal compass such as:
- I Rückpositiv CDE–c3
- II Werck CDEFGA–c3
- III Oberpositiv CDEFGA–c3
- IV Brustpositiv CDEFGA–c3
- Pedal CD–d1
In particular, I'm asking about the meaning of the letters for the lower end of the compass. Does "CD" in the pedal means there is no C# and "CDE" in the Rückpositiv means there are no C# and D#? This would mean the 2nd to the 4th manuals possessing no black keys in the lowest octave except the B-flat. Is this right?
