USB output to laptop not working(?)

[barneyd51]

I have had my Devialet 200 for a few years - love it - and am finally starting to play with the USB output to rip LPs. 
I have followed the (now very old) instructions to set the MIDI interface first, then open audacity. I set the Devialet (running firmware 10.1) to input from my turntable and it plays fine. But there is no signal being recorded in Audacity - just silent. In the Devialet configurator it labels the USB as an "input" - is this the problem? That my Devialet is too old to feature the bi-directional USB, i.e. it is only a source? 
I have seen an old thread (2015) in this forum with very similar issues, turned out to be a faulty circuit board in the Devialet. I hope it isn't that...
I also cannot find the Devialet document about the bi-directional USB - has disappeared from their web site. Anyone have a copy, that might help?

thanks

Dave