I don't know that board but if you want multiple tracks to the Mac you will need a multi-channel interface. Generally FX are run thru sends and returns on individual channels on the board but for later adjustment in the box you would want dry signals.
Do some reading. RTFMs if you got any with the gear or go to the mfg websites and print the pdf manuals - they should all be available.
BTW - This is probably not the correct forum for this question but at this point, not knowing what you have there, I'm not sure which one is.
lou