Update on this. Sadly the USB to SPDIF convertor did not work with the QC.
QC USB doesn’t power the device so no cigar there. Too bad, I’ll keep the convertor since its a pretty handly way to get optical out from a mobile device.
I wonder if the device was powered via a hub it would work, haven’t investigated that…
Hope NueralDSP considers a USB add on to generate SPDIF out since it seems like this should be possible. I’d like to use it with my RME interface without tying up two analog inputs.