I want to discuss about gothic organs. Now they practically obsolete, and we have wery few information about this magnificent instruments, but we know about it's main constructional principles. As we know, this instruments were relatively simple (in comparision with renaissance and baroque instruments), very clumsy and rough. But it's sound were probably very and very loud (every key was play up to 90 pipes of loud Principal!).
I heard, that huge gothic organ in Halberstadt cathedral was recently restored. But I don't know, were it modernized or no.
About half year ago I was made a digital (not electronic!) gothic organ, based on several samples of organs from XIII to XV centuries.
This organ based on Hauptwerk 1.0.0 technology. It works with digital MIDI keyboard, MIDI-interface and MyOrgan software. One keyboard divided into three sections: simulator of knee levers, lower manual and upper manual. Knee levers play 12 notes chromatically (Prestant 32'), lower manual - 22 notes (Prestant 8'), upper manual play 22 notes of composite blockwerk (Prestant 8' + 5 1/3' + 4' + 1').
I was create two supernatural effects for more realistic sounding: noise from big bellows and heavy "clicks" of keys.
Although I can't play all three sections together (because I haven't true knee levers for knees), it's possible to play on this organ medieval madrigals, hymns and gregorian chorals. The sound of this organ is very heavy, rough and loud. All stops are natural and recorded from original pipe organ stops.
I never heard the sound of gothic organ, but my digital organ looks very naturally. If you want, I can upload sound sample of my organ.
If you know something about this instruments, write, please. May be we'll have interesting discussion.