I have a Futro S900 and installed Slitaz 5 (assume it would be for 4 the same) - everything worked fine but I got no sound / mic on my headset / speaker.
To make a long story short:
The Futro S900 has an DVI display port (I'm using ...) and an HDMI display port - therefore it has 2 soundcards ...
$ aplay -l
shows this and gives you the numbers / names of the cards.
Unfortunately it seems that using Slitaz always the HDMI-card is used as default = card0
As I have only one user on this Futro I changed the default sound card by creating a file
with following contents:
"SB" is the name of the 2nd sound card - to write "card 1" would have had the same effect.
Now everything is working fine ... (haven't tested Skype until now - lol)
Thanks to: https://wiki.archlinux.org/index.php/Advanced_Linux_Sound_Architecture#Set_the_default_sound_card
-> there you find further details.
I thought I post this here and it might help someone else sitting in silence.
Regards - Ernst