record system sounds in powerpoint

 https://superuser.com/a/1133762

After enabling stereo mix and setting it as the source - default and app specific - I was still not picking up system sound on the PP recording. 

I had to point the output to speakers, which seemed to make the difference, and then plug headphones directly into the machine rather than through the USB adaptor which seemed to re-brand them as a Jabra device. 





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