I've been using a BST-75 for years without ever thinking about it. I have 12, 216 receivers tuned to ch 41 and they've worked perfectly until recently. I am working on a big set with lots of other rf from various departments and the director has complained that he experiences loud intermittent squealing while he is on set. I want to change the channel to let's say 44, because I know that another mixer has had success in a very similar situation with that channel at that location with virtually the same equipment from all departments. What do the 10 switch positions translate to on the channels of the receivers?