I did that test, and none of them worked.
root@moon71:~# aplay -D plughw:1,3 /usr/share/sounds/alsa/Front_Center.wav
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
aplay: main:660: audio open error: No such file or directory
root@moon71:~# aplay -D plughw:1,5 /usr/share/sounds/alsa/Front_Center.wav
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
aplay: main:660: audio open error: No such file or directory
root@moon71:~# aplay -D plughw:1,7 /usr/share/sounds/alsa/Front_Center.wav
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
aplay: main:660: audio open error: No such file or directory
root@moon71:~# aplay -D plughw:1,9 /usr/share/sounds/alsa/Front_Center.wav
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
aplay: main:660: audio open error: No such file or directory
root@moon71:~# aplay -D plughw:1,8 /usr/share/sounds/alsa/Front_Center.wav
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
aplay: main:660: audio open error: No such file or directory
root@moon71:~#
root@moon71:~# aplay -D plughw:1,3 /usr/share/sounds/alsa/Front_Center.wav
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
aplay: main:660: audio open error: No such file or directory
root@moon71:~# aplay -D plughw:1,5 /usr/share/sounds/alsa/Front_Center.wav
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
aplay: main:660: audio open error: No such file or directory
root@moon71:~# aplay -D plughw:1,7 /usr/share/sounds/alsa/Front_Center.wav
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
aplay: main:660: audio open error: No such file or directory
root@moon71:~# aplay -D plughw:1,9 /usr/share/sounds/alsa/Front_Center.wav
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
aplay: main:660: audio open error: No such file or directory
root@moon71:~# aplay -D plughw:1,8 /usr/share/sounds/alsa/Front_Center.wav
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
aplay: main:660: audio open error: No such file or directory
root@moon71:~#
in /etc/pulse, there is NO default.pa file.
Only one file: client.conf.
Thanks,