So, making progress.
Managed to get the extension to install with:
sudo npm install --unsafe-perm --build-from-source
and then ran the software with
npm app.js
so no it appears within roon an extension. Configured it and set the serial device to my USB>>RS232 adaptor.
I’ve got control of the speakers via roon BUT there is something funny going on, the volume gauge within roon keeps resetting to “45”, but i can see in the ssh on the Rpi that the extension is getting the true volume response from the speakers, it just looks like the extension isn’t processing it properly. Also I don’t get the “standby button” even though I can see “standby-enabled” within the ssh trace.
Any ideas @danny @MotorCity?
Thanks