External MIDI pad triggers EXS samples to restart loop or stop it- how to?

I am looking to set up the EXS24 in Logic 8 to trigger samples via an
external MIDI drum pad controller. i.e a drummer hitting a drum pad live.

I want the looped drum sample to start when triggered via MIDI drum 
pad 1. But also to stop when triggered via a different pad, say pad2. 

I would also like to have it set up so the loop restarts itself when
the drummer hits pad 1 if the loop is playing i.e the band is going
out of time with the loop so the drummer hits pad 1 again and this
restarts the loop from the beginning. 

Any help is appreciated?
Thx in advance
Sam 


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