Have you gone into Audio MIDI setup on your MacBook to see if the Mac is seeing your Astell & Kern AK380?
Sometimes, I have to enable my Oppo HA-2 there before JRiver sees it.
I have to toggle the device in Audio MIDI setup and select my Oppo.
Try that and see if then JRIVER see it.
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Equipment:
Power Conditioning PS Audio Power Plant Premiere
Pre-Amp Pioneer Elite SC-65 Amp Anthem PVA7 Main Speakers Bryston Mini-T Speakers Surround Speakers Sonus Faber Concertino
Subwoofer REL Stadium III Sub-Bass System BluRay Player Oppo BDP-105 Blu-Ray
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