Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

/usr/share/doc/libasound2-plugins/examples/

//usr/share/doc/libasound2-plugins/examples/a52.conf_pulse

 # Description: This will make it possible to use a52 with PulseAudio out of
#              the box. It may be useful for other use cases. Just include
#              this in your ~/.asoundrc .

pcm.a52 {
    @args [ CARD ]
    @args.CARD {
               type string
               default 0
    }
    type plug
    slave {
           pcm {
               type a52
               card $CARD
           }
    }
}

# Usage: aplay -D a52:0 /foo.wav