EXS 24 Logic Sampler Users Group

Hi everyone,
I'm trying to build an environment that will simulate the pedals on a 
harp.  I basically want to set up seven MIDI controllers to act like 
the seven pedals on a harp.  Harps are diatonic instuments...seven 
notes to the octave.  The pedals on a real harp raise and lower the 
pitch of the string by a half step.  I would like to set it up so that 
I can strum a glissando from my midi keyboard.  I'm pretty sure this is 
possible....at least it is in Gigasampler.  I just can't get my head 
around it.

So....for an example I need to create a controller that sends a 
continuous midi message that controls all D notes on the keyboard.  
above a certain value range would raise the pitch a half step....below 
a certain value range would lower the pitch a half step.  I'd love some 
help....

Thanks a bunch,
julie