This is direct from the boot logs: default.pa file in ~/.config/pulse
#!/usr/bin/pulseaudio -nF # .include /etc/pulse/default.pa .fail set-default-sink alsa_output.pci-0000_00_1f.3.analog-surround-40 load-module module-remap-sink sink_name=remap-analog-surround-40 master=alsa_output.pci-0000_00_1f.3.analog-surround-40 channels=4 channel_map=front-left,front-right,rear-left,rear-right master_channel_map=front-left,rear-left,front-right,rear-right remix=no ### Make some devices default #set-default-sink output set-default-sink remap-analog-surround-40 #set-default-source input syslog portion where fails to load: Dec 27 13:33:33 david-MacBookPro pulseaudio[1422]: Starting GLib main loop Dec 27 13:33:33 david-MacBookPro pulseaudio[1422]: Loaded "module-filter-heuristics" (index: #21; argument: ""). Dec 27 13:33:33 david-MacBookPro pulseaudio[1422]: Loaded "module-filter-apply" (index: #22; argument: ""). Dec 27 13:33:33 david-MacBookPro pulseaudio[1422]: Master sink not found Dec 27 13:33:33 david-MacBookPro pulseaudio[1422]: Failed to load module "module-remap-sink" (argument: "sink_name=remap-analog-surround-40 master=alsa_output.pci-0000_00_1f.3.analog-surround-40 channels=4 channel_map=front-left,front-right,rear-left,rear-right master_channel_map=front-left,rear-left,front-right,rear-right remix=no"): initialization failed. Dec 27 13:33:33 david-MacBookPro pulseaudio[1422]: Sink alsa_output.pci-0000_00_1f.3.analog-surround-40 does not exist. Dec 27 13:33:33 david-MacBookPro pulseaudio[1422]: Sink remap-analog-surround-40 does not exist. Dec 27 13:33:33 david-MacBookPro pulseaudio[1422]: Successfully connected to D-Bus session bus fd35a79135b7241371a4f2745fe88d2d as :1.8 syslog from same boot where analog-surround-40 is first mentioned: Dec 27 13:33:37 david-MacBookPro pulseaudio[1422]: Looking at profile output:analog-surround-40 Dec 27 13:33:37 david-MacBookPro pulseaudio[1422]: Checking for playback on Analogue Surround 4.0 (analog-surround-40) Dec 27 13:33:37 david-MacBookPro pulseaudio[1422]: Trying surround40:0 with SND_PCM_NO_AUTO_FORMAT ... Dec 27 13:33:37 david-MacBookPro pulseaudio[1422]: Managed to open surround40:0 Dec 27 13:33:37 david-MacBookPro pulseaudio[1422]: snd_pcm_hw_params_set_format(Signed 16 bit Little Endian) failed: Invalid argument Dec 27 13:33:37 david-MacBookPro pulseaudio[1422]: snd_pcm_hw_params_set_format(Signed 16 bit Big Endian) failed: Invalid argument Dec 27 13:33:37 david-MacBookPro pulseaudio[1422]: snd_pcm_hw_params_set_format(Float 32 bit Little Endian) failed: Invalid argument Dec 27 13:33:37 david-MacBookPro pulseaudio[1422]: snd_pcm_hw_params_set_format(Float 32 bit Big Endian) failed: Invalid argument Dec 27 13:33:37 david-MacBookPro pulseaudio[1422]: Maximum hw buffer size is 92 ms Dec 27 13:33:38 david-MacBookPro pulseaudio[1422]: Set buffer size first (to 4408 samples), period size second (to 1102 samples). Dec 27 13:33:38 david-MacBookPro pulseaudio[1422]: Device surround40:0 doesn't support sample format s16le, changed to s32le. Dec 27 13:33:38 david-MacBookPro pulseaudio[1422]: Profile output:analog-surround-40 supported. Dec 27 13:33:38 david-MacBookPro pulseaudio[1422]: Removing path 'analog-output' as it is a subset of 'analog-output-speaker'. analog-surround-40 is a valid setting for Sound output in the Settings dialog - and is set as the default output device.
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