Hi all,
i installed OMV 3.x (debian 
on a core duo machine.
Installed mpd, configured it by this guide (https://www.htpcguides.com/cre…d-music-server-on-debian/), but there's no sound.
It's strange because on a twin machine i installed OMV 4.x (debian 9) and it works perfectly.
The aplay -l command gives this result:
root@OMV:/etc# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC663 Analog [ALC663 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 3: ALC663 Digital [ALC663 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 7: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
Sound card seems to be working.
This is an exctract from my mpd.conf.
# An example of an ALSA output:
#
audio_output {
type "alsa"
name "My ALSA Device"
# device "hw:0,0" # optional
# mixer_type "hardware" # optional
# mixer_device "default" # optional
# mixer_control "PCM" # optional
# mixer_index "0" # optional
Someone could help me? 
I was so happy to connect my OMV to my 70s amplier....