This command returns that the plugin is not installed, I have tried it again in a fresh install and I don’t have it.
The additional cap did not solve the issue.
The flaw is gone for now, I don’t know what I did. I have got an error message inside Volumio, something like “failed to open ALSA…” and right after that it’s playing fine.
Looks like a software problem, but dunno how to investigate deeper. During the problem, the bitrate was not “transmitted” to the FIFO, everything was played with the same clock.
That being said, if It’s only software, why a fresh install does not solve everything…