The problem is in Windows 11 where it sometimes does not "see" the QMX as a sound card.? To compound this, when WSJT-X starts, it does a quick inventory of what sound devices are available.? If the QMX is not there at that time, it won't show up later, even if you fix the disappearing QMX device in Windows 11.
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The best course when this happens is to exit WSJT-X, unplug and plug in again the QMX, make sure it is recognized by Windows 11, and then restart WSJT-X.
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This doesn't happen all the time, but it is enough to be annoying.
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At least this has been my experience and my 2 cents.
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Mark
KD0QYN
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