Phat dac on Samplerbox dist

hello

i have some trouble to run phat dac on rpi2 with dist samplerbox.
Roughly, this dist is based on jessie. It is a read only dist but i have remounted it before making changes of course.

I have followed the tuto: "Setting up pHAT DAC"
But i get no sound.

root@samplerbox:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
root@samplerbox:~#

Following the conf files

file /etc/modprobe.d/raspi-blacklist.conf does not exist

root@samplerbox:~# more /boot/config.txt
dtoverlay=hifiberry-dac

root@samplerbox:~# more /etc/asound.conf
pcm.!default {
 type hw
 card 0
}
ctl.!default {
 type hw
 card 0
}
root@samplerbox:~#

root@samplerbox:~# more /etc/modules
> # /etc/modules: kernel modules to load at boot time.
> #
> # This file contains the names of kernel modules that should be loaded
> # at boot time, one per line. Lines beginning with "#" are ignored.

> i2c-dev
> #snd_bcm2835