i mean i can turn around or schratch my self or something. it can't be that sensitive, can it?
Yes, a mic is that sensitive. Its has to be in order to realistically reproduce stero images. If the mic couldn't pick up what was to "left", it wouldn't be able to produce that "left" and you won't hear it in your recording.
Easy way to simulate this is to listen to a small radio at a distance. While standing still looking forward, have someone move the radio from your left side to your right side. Can you hear how the image goes from all the way left to center to all the way right? Your mics "hear" the same way.
If you face the stage and look to the left, then slowly turn your head to look right, you recording will "pan" from right to left (opposite of your turn).
i wont bother with venue owners, rather stealth, or should I bother?
Why not bother??? Venue owners aren't ogres. They are generally good people that like music. Our local music venue built us a taping booth after we befriended him. Tapers now have a booth next to the soundboard area so we aren't in the way or normal customers. He also talks to artists for us and has gotten permission from certain bands that normally don't allow taping.
And if you a friend with the owner, he's not going to have security kick you out if you are taping. He'll just tell you to quit.
Terry