And again on a claviorganum.
The claviorganum combines harpsichord and organ in a one or two manual chamber instrument. It has been known since the 15th century. Most old instruments are no longer playable, however, a few have been restored and copies have been built.
A contributor to CCH (takatsa) has combined the Mietke harpsichord (Sonus paradisi) and the Oosterwijtwerd sample set and created an odf for a claviorganum. For further information see
http://forum.hauptwerk.com/viewtopic.php?f=6&t=13513#p100090.
A few years ago, I had the opportunity to play on a modern copy of a 1745 instrument at the Oberlinger Organ Art Museum in Windesheim, Germany. I can say that the combination set sounds very well. I have slightly increased the volume of the organ part to achieve a better balance between organ and harpsichord.
If you want to listen to a master of the claviorganum, go to
https://www.jpc.de/jpcng/classic/detail/-/art/Claudio-BriziClaviorganum/hnum/7777183
and listen to the short demo tracks of a CD by Claudio Brizi with music by Sweelinck, Frescobaldi, Pachelbel, Buxtehude and Bach. His recordings are very impressive.