How can I add a mod wheel?

Question

I've got a Yamaha P-120 keyboard which I use as a controller for Logic. It's a really nice keyboard that I love playing on, but it doesn't have a mod wheel on it, and I'd really like to be able to send modulation data into Logic to take advantage of sophisticated sample libraries. Is there some way to add just that functionality?
One thing I thought of is getting an expression pedal, which the P-120 supports, enabling it to send expression data into Logic. Does Logic have some way to remap the incoming expression data to modulation data? Any other ideas? Thanks.

Answer 1

Never having used a pedal, I can only guess, but here goes:
First make sure your your pedal is plugged into your keyboard and your key board into your computer.
Then create a physical in object in the environment if there isn't already one there.
Next, attach a monitor object to the sum output of the physical in object and try using your pedal. You should see the monitor respond accordingly, displaying series of 3 numbers. Pay close attention to those numbers.
Now hook up the output of your monitor to a tranformer object and set the transformer's mode of operation to 'apply operation and let non corresponding values through'. Then set the transformer condition section to Control and the first 2 numbers to those your monitor outputs, leaving the 3rd field as thru.
Set the operation section to Control, fix 1, fix 1, again leaving the third field blank, and hook the object up to the instrument you want to control, or better still to the seq input.
That should be just yummy!
PowerBook G4 12"   Mac OS X (10.4.8)