My microRendu is not seeing my Holo Audio Spring DAC either directly or through the Matrix Audio x-spdif 2 after recently upgrading the SonicOrbiter software. I have power cycled everything and plugged the USB cables in and out of the microRendu.
The Audio device list in System Settings - Custom DAC has the following message:
“Error in alsa-capabilities (v0.9.1): aplay did not find any soundcard.”