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The AO unit in the Sbig case communicates directly to the camera, which, in turn, communicates with the software. You need to calibrate the AO unit, then the software tells the AO how far to tip/tilt, if it's too much, then the mount will need to be "bumped", TSX will take care of all of this, read the manual on AO, it's not rocket science. I've never used anyone else's AO unit, but I hear good reviews about the Orion unit, again, I think TSX can control these.
With your PMX, you should be using Directguide to make guiding corrections.
OAG is great if you have the backfocus available. I don't know about the ONAG unit, not many about.
I have had to give up on AO, as the scope doesn't have sufficient backfocus available. It's great when it's working and you can use OAG to guide in front of the filters.
Cheers
Stuart
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