How to make MIDI?

[Juha-Pekka Palmulaakso <juhpalmu@utu.fi>]

Now, only a week after getting my first A-100, I am planning to make
some custom operations to it... 8-)

The standard Hammond bass pedal sound (that bathtub effect...) is not what
I am looking for, and therefore I am planning to midifying (?) it and
then use some external sound module with good bass samples. 

But first I have to ask what is Your opinion about this kind of operation?
I want to leave the original wiring and contacts as they are and use tiny
micro-switches to make new pedal contacts. I think that those are not a
problem, but how about the electronics? Is there any simple and/or cheap
way to make suitable controlling circuit or do I have to buy a MIDI
keyboard and make an autopsy to it...

Regards,

J-P