[Nodxa] K3 KIO3B RTTY question

[Dan]

This past weekend I did the ARRL RTTY RU with the K3. I have the USB KIO3B installed and tried to use the built in sound card. The receive part of the audio chain worked fine but I could get no transmit audio. I used my SIgnal Link to XMIT.
After the test I dug into the problem and am stumped. Nothing I do gets the RTTY audio to the K3 USB card. The Windoze widget says the MMTTY audio is there but the radio doesn’t key (using VOX) even if I put it in transmit manually.
I’ve tried resetting everything and the computer sees the KIO3B as an audio USB codec as it should. I tried setting the mike input to LINE to no avail. I’ve disabled all other audio devices. I sacrified a chicken to JOBOO but no joy.

I’m hoping there is a simple setting I’m overlooking and hoping someone with a K3 or K3s has an idea.

Thanks
Dan W8CAR