[A-800 Pro] Using Rotary Switches / Faders to control Expression and Modwheel

Hi, welcome to the forum. I don't have Logic, but the best way (safest way) would be this:
 
1. In the A-Pro Editor, go to Option -> MIDI Device, and select "A-PRO 2" from the Input port and "A-PRO" from the Output port.
2. Click on the S8 slider in the editor and then set up the options like this (ignore the "P2" in the upper left corner): http://i.imgur.com/wgG0dvW.png
3. In Logic, select "A-PRO 1" (if it's not there you should check the MIDI device configuration page in Logic) from the MIDI track's input drop-down. Although "All inputs" or "None" or "omni" or whatever that means the same also works, I recommend choosing A-PRO1 for some complicated reason.
 
If you're wondering why you need to choose "A-PRO2" at Step 1 and "A-PRO 1 (Port 1)" at Step 2 & 3, it's because modulation data, as well as musical data like note and velocity information, should go through the A-PRO 1 port and flow into the MIDI track to control the modulation of a synth that track uses, while other controller data should use the A-PRO2 port to control various parameters of Logic (e.g. faders, pan controls in the mixer).
 
Hope that helps (hope I'm not wrong )