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Hi there, I own one of these: http://www.hammondclub.nl/db/upload/cache/image_resized/539x422/J_412_1972_OK.jpg. I bought it for $40 years ago and it's not valuable by any means. I use it right now as a conversation piece/bookshelf. However, I would really like to make it a useable instrument for my band (I play multiple keyboards). I am familiar with MIDI but no matter how much research I do, I still wind up getting confused about "DIY"ing. I want to convert this to a MIDI controller (I don't care about the organ stops, just the on/off/volume knob) and be able to use it with Logic as a basic starter module. I already have my three keyboards; I'd like this one as simply a way to add more texture/layers and the foot pedals. Would someone kindly be able to provide me with a tutorial that is user friendly to a MIDI rookie and let me know exactly what parts/board, etc. I would need for this project. I'd really appreciate it so much!! Thanks

I've been unsuccessfully trying to get hold of a Native Instruments B4D drawbar MIDI controller. So I decided to build my own. I had a Raspberry Pi lying around, and hadn't come across this site back then, so I decided to use the Pi to control it all. I've tried out IO piggy back boards and ADC piggy back boards. The Raspberry Pi experiments were successful. I have a Java program reading the IO ports and the ADC channels, and sending MIDI events over the Pi's USB to a USB-MIDI adapter and a synth. Then I obtained some Hammond drawbars. They aren't B3/C3. They are from an H100, allegedly. I've read the posts here, about the original wiring of the drawbars, but I'm still confused. I understand that they are giant switch buses and not potentiometers. But all the buses are connected to each other by a little circuit board at one end. I wondered if there were some differences in resistance between the ciruit board connections, but it doesn't seem so. It's not a show stopper as I can unsolder the circuit board and add some resistors as mentioned elsewhere on the forum, but I'd love to understand what I'm disconnecting. Can anyone kindly explain how everything isn't actually connected to everything, please??