Maybe something's not installed.

My Input Drivers are (in this order):
- Microsoft Sound Mapper (highlighted)
- Microphone (High Definition Aud
- Microphone (Digital Video Recor
- Line In (Digital Video Recorder

My Output Drivers are (in this order):
- Speakers (High Definition Audio (highlighted
- Microsoft Sound Mapper
- Speakers (High Definition Audio
- Speaker (Digital Video Recorder

I installed BIAB 2017 from a PGMusic distributed usb stick, onto my Windows 10 Enterprise 64bit laptop. I took all the defaults at install time.

I did find this page, and will go through it's suggestions:
http://www.pgmusic.com/tutorial_rbw_nosound.htm

Thanks, everyone, for your help....