Israsta:
This is a GREAT project! Good job! The fact that this isn't on a more powerful Arduino family member is amazing! I would like to try this at some point. I'm currently using a VOCE MicroB for Hammond sounds but it doesn't allow me control over the drawbars. Any chance key click will be added? My MicroB also does noise after key release but it is too loud. You probably don't need to add that. I currently use a Roland Leslie simulation pedal that includes overdrive. Probably a simple outboard overdrive guitar pedal will help you sound more like a Hammond. Good luck!