> I guess that's a possibility, assuming I can find one that isn't 
> touch-sensitive.

Oh ok I didn't realise the pedals didn't need to be touch sensitive, even 
simpler then!

> Assuming you find one that isn't touch-sensitive, so pressing a key just 
> closes a circuit, it should be possible to rig something up.

Alternatively use another input method to a PC (you can get multiple digital 
input to USB boards) and then generate the MIDI signals in software.

> The next problem is going to be how to make it sturdy enough to not fall 
> apart. ;-)

The pedals are not going to be taking massive forces so you don't need to 
worry about using bearings or anything fancy like that.  I would just put a 
hole through the pedal at the back and let it rotate on a bolt that is 
secured to some base-plate.  That way you can place each pedal at a 
different angle.  To provide the resistance just glue on a lump of stiff 
rubber underneath each pedal and mount a micro-switch to trigger at the 
correct position.  Shouldn't take too much work.

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