i see what your trying to do........assuming you have a anolog mixer and its running into your soundcard, then into your DAW computer.......
run one mic into channel 1 on the analog mixer, and pan it hard left. run mic 2 from the differnt speaker/cab into analog mixer channel 2....and pann that hard right.
use a stereo output from your analog mixer, and feed it into a stereo input in your sound card. if you only have one input in your soundcard,...youll have to get a "Y" cable that has 2 mono ends.....and a single stereo end on the other end of the cable. feed the 2 mono ends into the output of your analog mixer, and send that signal into the single stereo end into your computers soundcard.
ya with me so far? good.
once this is done.......record your clip/sound. now.....in your DAW software......look at your track. it should be a stereo signal track. if it is..........when you pann it in your comuters DAW, hard left will give you the one mic, hard right will give you the other mic, panned center will be a blend of both mics equaly.