This means that the keyboards should be very low profile, and mounted very close together.

At least three manuals, with the physical relationship between keyboards being something like those on a real organ (an AGO spec can be found ).

Larger organs require large amounts of memory (I have 32GB) and I don't want to buy 2 deskside computers.

Running the organ on my deskside computer that is used for many other purposes, including non-organ related music production.

When building the physical setup for my virtual organ I had to solve a few problems:

Other options are available ( for a good list), but Hauptwerk does the most complete job, and there is an amazing collection of sampled organs for Hauptwerk. I built my organ around the remarkable dedicated pipe-organ simulator software. This is the story of my virtual pipe organ. The pipe organ is very well suited to digital sampling technology, and in the last few years some very fine products have appeared that make it possible to have something like very large, beautiful pipe organs at home. I've long wanted a MIDI-based virtual organ. When connected to MIDI keyboards and an audio system, it can accurately simulate the sound of a real. GrandOrgue is a sample based pipe organ simulator. Blank Sheet Music is a free Windows software which has all kinds.

Organ Windows 7 - Free Download Windows 7.

Pipe organ simulator programs