G'day Doc,
I've been using 5.18 since it came out and it was the same in 5.16.
However I have had a eureka moment.
I have set the device properties to WaveOut, this allows me to select USB Mic in and Realtek out.
Stuck the headphones on and got the drum track in the headphones and tapped on the mic which is plugged into the Peavey mixer and bugger me.
It effing worked, time for a beer to celebrate.
Doesn't explain why I can select the desired options on the PC when selecting AISO drivers, but who cares I can now get on with recording our originals