how do i use either aplay or paplay and specify a device?  aplay fails
because pulseaudio hogs the devices?  and paplay and it's manpage and help
are no help trying to learn how to specify the desired device:

$  aplay -DS7 /usr/share/sounds/alsa/Front_Center.wav
ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM S7
aplay: main:830: audio open error: No such file or directory
$  aplay -Dhw:S7 /usr/share/sounds/alsa/Front_Center.wav
aplay: main:830: audio open error: Device or resource busy
$  paplay -dhw:S7 /usr/share/sounds/alsa/Front_Center.wav
Stream error: Invalid argument
$  paplay -dS7 /usr/share/sounds/alsa/Front_Center.wav
Stream error: No such entity
$  paplay -l
paplay: invalid option -- 'l'
$  paplay -L
paplay: invalid option -- 'L'
$  cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu Focal Fossa (development branch)"
$  dpkg-query -W alsa-utils
alsa-utils      1.2.2-1ubuntu1
$  dpkg-query -W pulseaudio-utils
pulseaudio-utils        1:13.99.1-1ubuntu2
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