During the weekend I managed to compile the driver for the TFA9879 (part of the bassfly-uhat).
Selecting the dt-overlay I can see the DAC in alsa and I can play sound with speaker-test
I followed those instructions to add compatibility to Volumio
I can select the added DAC in the playback options, the config.txt file is modified correctly after the selection
Volume control with HW Mixer woks fine (I can see the updated value from alsamixer if I change volume from Volumio)
Unfortunately I can’t hear any audio coming out from the speaker if I start the playback, I also don’t get any error
What can I do for checking what’s happening? It looks like the output is not selected correctly