Uh ... a little correction is in order, here
You obviously do not have a SONY α100, 'VR'.
If you did, you would know that when the Camera is set to "AUTO" ISO and the Mode dial is in the "M" (Manual Mode) position, ISO is automatically FIXED @ 100. That's not so good, is it ... under the lights?
You really need to know the equipment being used BETTER before you make these kind of setting suggestions (or at least have read the accompanying manual). They are NOT "Universal!"
Hey, thanks for trying, though. When are you buying your Alpha?