Graham, exactly what is your setup? Are the audio mics or are you recording directly from the Yamaha to your computer? Or are they USB mics? The reason I ask is because it makes a difference. If it is USB then maybe Window is turning those ports off. If it is audio then maybe either Windows or your DAW/BiaB is loosing the connections.

If you are using audio mics then I would ask why?


Doc-take it easy John this is just a sharp scalpel. It will not cut deep so don't worry.
Me-I'm not John
Doc-I know, I am!

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware