When following the guide I can successfully enable audio output for example with mpg123 -o pulse . Without -o something else is chosen and gives garbled output rendering much too fast – a 3min MP3 is finished within <30s. aplay -L shows the correct list of devices and aplay gives clear output. (Raspbian Buster)
mp3blaster works right away with the same MP3-files, didn’t check on which device/ through which library.
null Discard all samples (playback) or generate zero samples (capture) jack JACK Audio Connection Kit pulse PulseAudio Sound Server default Playback/recording through the PulseAudio sound server sysdefault:CARD=sndrpihifiberry snd_rpi_hifiberry_dac, Default Audio Device dmix:CARD=sndrpihifiberry,DEV=0 snd_rpi_hifiberry_dac, Direct sample mixing device dsnoop:CARD=sndrpihifiberry,DEV=0 snd_rpi_hifiberry_dac, Direct sample snooping device hw:CARD=sndrpihifiberry,DEV=0 snd_rpi_hifiberry_dac, Direct hardware device without any conversions plughw:CARD=sndrpihifiberry,DEV=0 snd_rpi_hifiberry_dac, Hardware device with all software conversions usbstream:CARD=sndrpihifiberry snd_rpi_hifiberry_dac USB Stream Output