Shawn,My impression is that 1.0, 1.1, 1.2 should work just fine without mod, and 1.3 needs the mod. Is this a correct assumption?
Your assumption is correct. I asked what the differences were from 1.0 to 1.1 and 1.2 and no one really knew (of course I should have asked Behringer). No one noticed a difference either at any rate.
I'm betting that any changes affected the original target audience (PA system guys who needed to kill feedback issues)
That being said, it seems the chances of finding anything but 1.3 in the stores is pretty **** low. YOu'd have to find a place that did not move a lot of stock to find the older versions.