Having 'rescued' the bass pedals from an old organ, I wish to use them as add-ons to my keyboards, when the bassist can't make it.What is a simple way to connect them so that they work through the keyboard, or sound module? I guess MIDI may be the way to go, but any advice from anyone who has successfully achieved this would be good.
Far less expensive is a $45 MIDI-CPU. If your pedalboard already has switches, great. Otherwise buy reed switches, diodes, and magnets from digikey or jameco. The forums for the MIDI-CPU explain every step and snag of rebuilding your own pedalboard, from soldering on up. (I'm just a satisfied customer.)
I haven't done this, but there are kits from organ-building companies that enable you to install a sensor under each footpedal, all of which are connected to a MIDI interface.
After a Google search, I found a link to this product at Classical MIDI Works in Canada.
There are also several companies that sell complete, stand-alone MIDI bass pedal controller units that range from one octave to two-and-a-half octaves. Roland, Nord, Keith McMillen, and Hammond are four of them.