Gian,

I wonder if you've made any progress in tracking down your problem. Just
to satisfy myself, I installed Ubuntu 14.04 LTS Desktop in VirtualBox
and attached my external USB DAC to the virtual machine. 

During the install I elected to include 3rd party software and updates. 
After the install I added the squeezelite package from the command
line:


Code:
--------------------
    sudo apt-get install squeezelite 
--------------------


Checked what sound devices existed on the system:


Code:
--------------------
    chris@U14-VirtualBox:~$ aplay -l
  **** List of PLAYBACK Hardware Devices ****                                   
                                                                               
  card 0: Intel [HDA Intel], device 1: STAC9221 A1 Digital [STAC9221 A1 
Digital]                                                                        
       
  Subdevices: 1/1                                                               
                                                                             
  Subdevice #0: subdevice #0                                                    
                                                                             
  card 1: CODEC [USB Audio CODEC], device 0: USB Audio [USB Audio]              
                                                                               
  Subdevices: 1/1                                                               
                                                                             
  Subdevice #0: subdevice #0   
--------------------


and


Code:
--------------------
    
  chris@U14-VirtualBox:~$ squeezelite -l                                        
                                                                               
  Output devices:                                                               
                                                                               
  default                        - Playback/recording through the PulseAudio 
sound server                                                                    
  null                           - Discard all samples (playback) or generate 
zero samples (capture)                                                         
  pulse                          - PulseAudio Sound Server                      
                                                                             
  sysdefault:CARD=Intel          - HDA Intel, STAC9221 A1 Analog - Default 
Audio Device                                                                    
  
  front:CARD=Intel,DEV=0         - HDA Intel, STAC9221 A1 Analog - Front 
speakers                                                                        
    
  surround40:CARD=Intel,DEV=0    - HDA Intel, STAC9221 A1 Analog - 4.0 Surround 
output to Front and Rear speakers                                            
  surround41:CARD=Intel,DEV=0    - HDA Intel, STAC9221 A1 Analog - 4.1 Surround 
output to Front, Rear and Subwoofer speakers                                 
  surround50:CARD=Intel,DEV=0    - HDA Intel, STAC9221 A1 Analog - 5.0 Surround 
output to Front, Center and Rear speakers                                    
  surround51:CARD=Intel,DEV=0    - HDA Intel, STAC9221 A1 Analog - 5.1 Surround 
output to Front, Center, Rear and Subwoofer speakers                         
  surround71:CARD=Intel,DEV=0    - HDA Intel, STAC9221 A1 Analog - 7.1 Surround 
output to Front, Center, Side, Rear and Woofer speakers
  iec958:CARD=Intel,DEV=0        - HDA Intel, STAC9221 A1 Digital - IEC958 
(S/PDIF) Digital Audio Output
  dmix:CARD=Intel,DEV=0          - HDA Intel, STAC9221 A1 Analog - Direct 
sample mixing device
  dmix:CARD=Intel,DEV=1          - HDA Intel, STAC9221 A1 Digital - Direct 
sample mixing device
  dmix:CARD=Intel,DEV=2          - HDA Intel, STAC9221 A1 Alt Analog - Direct 
sample mixing device
  dsnoop:CARD=Intel,DEV=0        - HDA Intel, STAC9221 A1 Analog - Direct 
sample snooping device
  dsnoop:CARD=Intel,DEV=1        - HDA Intel, STAC9221 A1 Digital - Direct 
sample snooping device
  dsnoop:CARD=Intel,DEV=2        - HDA Intel, STAC9221 A1 Alt Analog - Direct 
sample snooping device
  hw:CARD=Intel,DEV=0            - HDA Intel, STAC9221 A1 Analog - Direct 
hardware device without any conversions
  hw:CARD=Intel,DEV=1            - HDA Intel, STAC9221 A1 Digital - Direct 
hardware device without any conversions
  hw:CARD=Intel,DEV=2            - HDA Intel, STAC9221 A1 Alt Analog - Direct 
hardware device without any conversions
  plughw:CARD=Intel,DEV=0        - HDA Intel, STAC9221 A1 Analog - Hardware 
device with all software conversions
  plughw:CARD=Intel,DEV=1        - HDA Intel, STAC9221 A1 Digital - Hardware 
device with all software conversions
  plughw:CARD=Intel,DEV=2        - HDA Intel, STAC9221 A1 Alt Analog - Hardware 
device with all software conversions
  sysdefault:CARD=CODEC          - USB Audio CODEC, USB Audio - Default Audio 
Device
  front:CARD=CODEC,DEV=0         - USB Audio CODEC, USB Audio - Front speakers
  surround40:CARD=CODEC,DEV=0    - USB Audio CODEC, USB Audio - 4.0 Surround 
output to Front and Rear speakers
  surround41:CARD=CODEC,DEV=0    - USB Audio CODEC, USB Audio - 4.1 Surround 
output to Front, Rear and Subwoofer speakers
  surround50:CARD=CODEC,DEV=0    - USB Audio CODEC, USB Audio - 5.0 Surround 
output to Front, Center and Rear speakers
  surround51:CARD=CODEC,DEV=0    - USB Audio CODEC, USB Audio - 5.1 Surround 
output to Front, Center, Rear and Subwoofer speakers
  surround71:CARD=CODEC,DEV=0    - USB Audio CODEC, USB Audio - 7.1 Surround 
output to Front, Center, Side, Rear and Woofer speakers
  iec958:CARD=CODEC,DEV=0        - USB Audio CODEC, USB Audio - IEC958 (S/PDIF) 
Digital Audio Output
  dmix:CARD=CODEC,DEV=0          - USB Audio CODEC, USB Audio - Direct sample 
mixing device
  dsnoop:CARD=CODEC,DEV=0        - USB Audio CODEC, USB Audio - Direct sample 
snooping device
  hw:CARD=CODEC,DEV=0            - USB Audio CODEC, USB Audio - Direct hardware 
device without any conversions
  plughw:CARD=CODEC,DEV=0        - USB Audio CODEC, USB Audio - Hardware device 
with all software conversions
  
--------------------


Edited /etc/default/squeezelite


Code:
--------------------
    
  chris@U14-VirtualBox:~$ cat /etc/default/sysconfig
  cat: /etc/default/sysconfig: No such file or directory
  chris@U14-VirtualBox:~$ cat /etc/default/squeezelite
  # Defaults for squeezelite initscript
  # sourced by /etc/init.d/squeezelite
  # installed at /etc/default/squeezelite by the maintainer scripts
  
  # The name for the squeezelite player:
  SL_NAME="$(hostname -s)"
  
  # ALSA output device:
  SL_SOUNDCARD="*plughw:CARD=CODEC,DEV=0*"
  
  # Squeezebox server (Logitech Media Server):
  # Uncomment the next line if you want to point squeezelite at the IP address 
of
  # your squeezebox server. This is usually unnecessary as the server is
  # automatically discovered.
  #SB_SERVER_IP="192.168.x.y"
  
  # Additional options to pass to squeezelite:
  # Please do not include -z to make squeezelite daemonise itself.
  SB_EXTRA_ARGS="-a 80:40::0"
  
--------------------


I choose *plughw:CARD=CODEC,DEV=0* as the sound device to allow for
possible rate conversion by ALSA, like your KingRex, my USB DAC is only
16bit upto 48KHz, and then restarted the squeezelite service: 


Code:
--------------------
    
  sudo service squeezelite start
  
--------------------


and checked it was running: 


Code:
--------------------
    
  chris@U14-VirtualBox:~$ ps aux | grep [s]queezelite
  root      3889  5.5  3.8 285312 39656 ?        SLl  09:27   0:03 
/usr/bin/squeezelite -n U14-VirtualBox -o hw:CARD=CODEC,DEV=0 -a 80 40  0
  
--------------------


My version of LMS is: Logitech Media Server Version: 7.8.0 - 1384496306
@ Sat Nov 16 19:06:17 PST 2013

I played radio stations needing mp3 and AAC, and 16/44 resolution FLAC
audio files.  

I was not able to re-produce your error.  Pulseaudio does not appear to
be a problem. Perhaps your debug log will offer some clues.


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