VIRGIL - the FREE Pipe/Church Organ Synthesizer

YouTube via syntesen
"Levo Sound Tools presents VIRGIL - the world's first free pipe organ synthesizer.

"Organ synthesizer" means that absolutely no samples are used in the sound generation. Each tone is generated by 52 oscillators, which are on/off switchable. The pipes range from 64' profound (sub-sub octave) to 1' flageolet. There are also combination (mixture) stops, some of which fatten up the sound in unpredictable ways, as well as a tremulant.

To guarantee authenticity, the synthesizer is not limited to a 100% pitch pure pipe simulation; rather, the user can detune the pipes slightly to recreate that authentic pipe organ sound. On top of this, the pipe noise feature adds authentic pipe blowing noise. For good measure, we've thrown in a global low pass filter as well.

The quality of the synthesizer is selectable to guarantee low CPU usage on all systems. (10 tones with all stops enabled results in 12% CPU usage in 64-bit mode, 5% in 32-bit mode on a Core 2 Duo 2.4 GHz processor)

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VIRGIL is, and will always be free, but as the principal developer is a poor medical students, donations are very much appreciated. In return for a $5 donation, you will receive the pre-release version of VIRGIL used in the background music of this video.

All donations will be put to use in further developing VIRGIL, as well as, eventually, porting the synthesizer to Windows."
http://www.youtube.com/user/syntesen