In JT65/JT9, I often will try to find a clear transmit frequency, and by
turning off TX/RX lock, work other stations split-frequency.
In the hectic waterfall of FT8, that is something I would especially like to do
in this mode - I don't want to step on other callers to a CQ'ing station, and
I had a problem a couple of times last night when I was calling a station, but
then another station called me (and my original target had not responded).
Double-clicking the new caller's call didn't switch messages - the program kept
calling the original target. I had to halt TX, then
