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