Hi @YOSHIFUMI_SHIOZAWA,
Thank you for your patience while we worked through the queue. What happens when you try to enable the D-08u? How is it connected to your network?
Thank you for your reply. solved. It went well.
Sound was output from Core via HPplayer via USB connection to D-08u DAC.
Also, direct USB connection from the ROON server on another PC to the D-08U was OK, and sound was also output from the ROON server via HQplayer.