Thanks for the info guys, but RF feedback is only part of the problem. There is still audio distortion caused by having to run the mic input and H/W mic gain at too high a level (with the 707 mic). I didn't have that problem with v2.041XT, nor do I have it with v3.028 and the 706 mic. I'd still like to be able to use the 707, though. 73 Ray W2RS