We are most appreciative of the following info from Anthony Williamson / Product Support Manager – Bluesound Support Crew. He writes:
Richard’s best bet is probably using the TOSLink out of the Bluesound Node into his DAC if he wishes to bypass our on board DAC. The TOSLink put is fully capable of 24/192 output. The USB port is an input for content such as a USB Memory stick or Bluetooth adaptor. There are no drivers to recognise a PCM Convertor built into the BluOS firmware.
You can contact him HERE