SSL 2+ playback device didn't work (device or resource busy)

[Mikhail Gavrilov]

Hi.
Got a brand new SSL 2+ sound card today.
If the recording works (not ideally) I would like to work with each
channel both separately and in stereo mode.
That playback does not work at all.
The device is defined as a quad channel and it would be better to see
this device as two separated stereo devices.

$ systemctl --user stop wireplumber.service

$ aplay --device sysdefault:CARD=ILDSP ~/Music/Modern\ CD/01.\ I\
have\ found\ my\ love\ in\ you.wav
Playing WAVE '/home/mikhail/Music/Modern CD/01. I have found my love
in you.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
^CAborted by signal Interrupt...
aplay: pcm_write:2127: write error: Interrupted system call

$ aplay --device sysdefault:CARD=S2 ~/Music/Modern\ CD/01.\ I\ have\
found\ my\ love\ in\ you.wav
ALSA lib pcm_dmix.c:1032:(snd_pcm_dmix_open) unable to open slave
aplay: main:831: audio open error: Device or resource busy

$ aplay --device sysdefault:CARD=S2 ~/Music/Modern\ CD/01.\ I\ have\
found\ my\ love\ in\ you.wav
ALSA lib pcm_dmix.c:1032:(snd_pcm_dmix_open) unable to open slave
aplay: main:831: audio open error: Device or resource busy

$ systemctl --user start wireplumber.service

http://alsa-project.org/db/?f=99ecd60a74fe21e14262ec53475437b413ae5602

-- 
Best Regards,
Mike Gavrilov.