The claviorganum that Claudio Brizi uses is described in the image - you'll see the harpsichord is a copy of a baroque instrument, the organ sounds good in early music to me, I think the link between the two offer more possibilities than any old instrument did. He can play harpsichord from the pedals for example.
His style of play is very different from Leonhardt's claviorganum CD on alpha. Where Leonhardt uses the two instruments in one piece, he seems to use them really to give the effect of greater sustain of a harpsichord note. Brizi is much more ready to let the organ take one voice and the harpsichord take another. In Arauxo this is a nice thing to hear I think. I have no idea what if anything is known about historical claviorganum style. Note that these comments about Leonhardt are from memory, I'll check later. Added. Not quite correct of Leonhardt, but the tone of organ seems more blended with that of the harpsichord.
His way of playing seems very natural and expressive. I originally started to listen to the CD because it includes a fantasy by Abraham van den Kerckhoven, rather beautifully played I think. Even in very familiar music, music I've thought about, like BWV 684, I enjoyed hearing what he does - not the deepest presentation of Christ's baptism in the Jordan perhaps, but still, rather good, a bold conception which avoids the trap of trying to make the music depict a river. He certainly makes sounds like I've never heard before (just listen to My Lady Carey's Dumpe) - but . . . I liked it. It sounded right.
The whole booklet is on Brizi's website, including an interview. he comes across as an inspired and imaginative musicianhttp://www.claudiobrizi.com
Anyway, I hope someone else will listen to this extraordinary CD and post their comments, it's on spotify.
(Does anyone have any information about the instrument Leonhardt used? I don't have the booklet.)