After a fresh install with lxde-core, lightdm, alsa-utils, alsactl init (alsactl init 0, alsactl init 1) and settings with alsamixer (volume and unmute), here I am.
No sound anymore, and hidden error messages on aplay command lines.
It was working with the complete task-lxde-desktop package : It means that something is missing here but I don't know what.
For gurus here it will probably be obvious but not for me
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root@Asus-Julien:~# cd /usr/share/filezilla/resources
root@Asus-Julien:/usr/share/filezilla/resources# dir
16x16 32x32 cyril dropdown.png lone sun up.png
20x20 48x48 defaultfilters.xml finished.wav minimal tango xrc
24x24 blukis down.png leds.png opencrystal theme.xml
root@Asus-Julien:/usr/share/filezilla/resources# aplay finished.wav
ALSA lib pcm_dmix.c:1022:(snd_pcm_dmix_open) unable to open slave
aplay: main:722: audio open error: No such file or directory
root@Asus-Julien:/usr/share/filezilla/resources#
It's like GUI software developers aren't aware about any way to give important information to the user ! like everybody's living in a terminal or into a cave
Of course it's useful to be able to design scripts that can handle everything by command lines, but it's not supposed be a good GUI for average users like me
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root@Asus-Julien:/usr/share/filezilla/resources# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 0: CX20751/2 Analog [CX20751/2 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
root@Asus-Julien:/usr/share/filezilla/resources#
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root@Asus-Julien:/usr/share/filezilla/resources# alsactl init 0
Found hardware: "HDA-Intel" "Intel Haswell HDMI" "HDA:80862807,80860101,00100000" "0x8086" "0x2010"
Hardware is initialized using a generic method
root@Asus-Julien:/usr/share/filezilla/resources# alsactl init 1
Found hardware: "HDA-Intel" "Conexant CX20751/2" "HDA:14f1510f,1043178d,00100100" "0x1043" "0x178d"
Hardware is initialized using a generic method
Thank you in advance !