My Hauptwerk organ project or The metamorphosis of my old Dr. Boehm-organ

	That was my old organ, a Dr. Boehm Bnt_SAKRAL, built in 1977 (DIY), before the reconstruction started: 28 speaking stops, tutti, keysplit, special effects, reverbation, stereo. There were no amplifiers built in, I used my HIFI-Stereo-set or my AKG K240 headphones as I do it now with Hauptwerk (the headphones you see on the right side of the organ aren't the AKG, this is my son's computer head-set).		What is Hauptwerk? What is MIDI? Background Specifications and experiences
	The organ case opend, you see the bottom side of the boehm keyboard, each key with it's own switch board, each of it with 8 switches. The keyboard-switches are wired to the sound generator with 97 single wires. Above the keyboard you can see the bottom side of the sound filtering board with 28 stop switches. The sound filters consist of resistors, capacitors and coils.
	The multiple key-contacts in detail. On each switchboard there are 8 resistors mounted for de-coupling each output from the others. All of the old equipment was to be removed to get space for 2 (!) MIDI-keyboards and some additional electronics (see schematic, little far below).
	The new wooden keyboard-frame for two M-Audio keystations 61es. For the pedal board I purchased a Doepfer CTM-64 contact-to-midi-converter and connected one of the 2 unused switches of each pedal key to the CTM-64.
	One of the new MIDI-keyboards already extracted from it's case and mounted on the new frame.
	Both MIDI-keyboards mounted on the new frame and inserted in the organ case. It was a question of millimeters, but finally it fitted. The swell pedal containes 2 potentiometers (L+R) with only 90° rotation and a value of 1 MOhm. I connected one of them to the upper manual instead of the M-Audio slide controller. I wasn't shure if it would work, because the slide controller has a value of only 10 kOhm - but it works.
	Ready to play.... The notebook is placed on a turnable platform and is easy to remove. So both the notebook and the organ are still portable (aechz). The computerscreen shows the GUI (the virtual console) of the organ of St. Anne's, Moseley, Birmingham, England. It is a two-manual, thirty speaking-stop organ from an Anglican parish church. This sampleset is included with the Hauptwerk program, but I have modified the GUI a little according to my preferences.
	Schematic diagramm of my Hauptwerk configuration.
Many thanks for visiting my homepage and spending your time with my short story. Created 2006-09-02. Last update 2009-12-24.

For more information about Hauptwerk visit Milan Digital Audio on the Internet: www.hauptwerk.com Hauptwerk, Hauptwerk virtual pipe organ is a trademark of Milan Digital Audio LLC