If you are interested in pipe organs but can't afford one, check out Hauptwerk and its collection of hundreds of pipe organ sample sets from everywhere in the world.

Check also its open-source alternative, GrandOrgue.

There are excellent and free sets that work with both at http://piotrgrabowski.pl.

Musicians spend thousands of dollars to build MIDI organ consoles or convert real consoles to use with these virtual pipe organs, myself included. PCs with 64GB RAM and server specs are not uncommon.