Well I do not know how to say this but the sound problem has returned, when I exit any of WOFFUE and it only happens with WOFF I have Flightgear, il2 and ROF no problems.

The good news is to stop the buzzing I pause WOFF and then Ctrl +Q to exit the sim and all is ok I have no need to reboot.

Just thought I would let you know never a dull day with a PC. Looks like I am the only person in the world with this problem with WOFF I am a lucky guy, I can live with pausing the sim.