FT8 14.074580 Data/USB
INPUT: Mic (2-usb audio Codec
Output speakers (2 usb audio codec
I am now showing 2 watts with the radio set at 100W and at 50W I am showing .4 Watts. I need to read a bit more also I went into my settings and sound and shut down windows.
Where should the power slider be about the middle
I run the power slider on WSJT-x wide open and control the audio level with in my case the audio input control of my Icom rigs. I can't remember if the 991a has an audio level control for the USB input or not. but you can use the windows speaker control for the USB audio codec. Make sure you understand which one your are adjusting,
not the computer speakers (usually a Realtec device). You can adjust the windows speaker control for the USB audio codec until the power out of the rig with the rigs power control set at maximum starts to fall. When the power starts to fall off from maximum you know you are not overdriving the modulator input because by using this method, there isn't enough audio to develop full output power..
Now if you want to run less overall power output, then you can easily adjust down your power slider on wsjt-x to decrease power further. But if you run it all the way to the top you still know that you cannot overdrive your rig because you have adjusted the windows control so that full power cannot quite be achieved. This is the easiest way I know to set these adjustments.
Of course windows update can easily "mess" with your adjustments.