You cannot control a given parameter (e.g. Wah position) directly with a MIDI cc.  Instead it is a two step process:

1)  Assign an expression pedal to the parameter that you want to control (using HD Edit or the hardware controls). 

2)  Use the Midi CC to control the Expression pedal position.

The same thing applies to turning effects on and off:  you assign a 'footswitch' to the effect and then control the footswitch with a MIDI CC.

You can get a full MIDI breakdown in appendix C of the advanced manual found here but for you ...

cc 001 = Expression Pedal 1

cc 002 = Expression Pedal 2

The value should be between 0 (heel down) to 127 (toe down)