man oh man... i've found myself in quite a quagmeir... here is what i'm lookin at: Im in a touring band (experimental rock, very hi fi) and we just recently put in a TC helicon Voice Works in our chian... it is a nice, but simple vocal effect unit that has a few bells and whistles. We dont play at the nicest of places very often, so we do as much of our own 'mixing and engeneering' ourselves... to eliminate problems associated with bad soundguys at dive bars. That includes having these voice effects on the front end (on stage) and sending an effected signal to the board. Here is where my problem comes in... We use Beta 58's (150 ohm Z) that go into the TC Helicon (40 ohm Z output). Where and why does it feedback, why is there signal degredation... can someone help explain to me the 'right course' of Impedence for a chain such as this? I have read that you should have a lower Z going to the board's equipment (that is higher Z than yours) if you want to keep this problem away. But i am worked up and confused about WHAT effect impedence, and how that plays into 'balanced and unballenced' lines. can anyone offer me up some advise or point me in the direction to find it? thanks so much!