You can record an individual channel from all the channels on the Peavey Mark III, up to 16 channels in your case. Use the 1/4 inch jacks that are next to the XLR input connectors.
The Pre-Out will give you a straight unchanged output without any EQ or Fader control at all.
The Post-Out will give you the EQed signal from the output and volume controlled by the Fader.
When you mix down, send your playback outputs to the Line Ins on the channels, mix it down, and take your mixed output from the Main A and B.
Ok, so i can use the pre or post sends as direct outs to the adat, that's what confused me alittle because the adat manual said to connect to the mixers bus outs witch would be the the 4 faders on the bottom right, main a&b and mon a&b outs on the back?