
Originally Posted by
lombardo
Hi all!
I can explain the "E1 - sounds C1, F1 - sounds F1, F#1 - sounds D1, G1 - sounds G1, G#1 - sounds E1"
You have described the short octave ("oitava curta"). It was used on some ancient potuguese, spanish and italian organs.
As there was no music with C#1 and D#, the organ builders didn´t make those pipes. It was less expensive and organ players could make 10ths. It's a very interesting aspect on some of these organs.
It becomes very funny when you play a C scale or the c arpeggio.
Lombardo