GrandOrgue allows the user to load and play virtual pipe organs. Using sample sets, GrandOrgue is able to combine the individual pipe sounds and organ behaviors to simulate a variety of pipe organs.

When connected to MIDI keyboards and an audio system, it can accurately simulate the sound of a real pipe organ.

The user can create and load organ samplesets using a dedicated file format. A demonstration organ sampleset is provided in the grandorgue-demo package.