Audinst hud-mx2 . Need to mute+unmute every track

Volumio Information

Volumio Version: 2.873
Hardware: Rasbperry Pi 2
DAC: Audinst HUD-MX2

After several attempts, I’ve been able to get sound out of my USB DAC. Everything looked ok (green light, no error…), but there was no sound at all. By chance I found out that if I mute and unmute one of the mixers of the card, it starts to sound.

However, every time I play a new track, or even one a track ends and the next one starts (it does not matter if it’s spotify or a web radio), the DAC goes silent again and I need to mute and unmute like this:

volumio@volumio:~$ amixer -c 5 set PCM,1 toggle toggle
Simple mixer control 'PCM',1
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]

and it sounds again.

For more info, these are the cards that I see with alsa:

card 5: HUDmx2 [Audinst HUD-mx2], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 5: HUDmx2 [Audinst HUD-mx2], device 1: USB Audio [USB Audio #1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

and these are the mixers

volumio@volumio:~$ amixer -c 5
Simple mixer control 'PCM',0
  Capabilities: pvolume pswitch pswitch-joined
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 45
  Mono:
  Front Left: Playback 42 [93%] [-3.00dB] [on]
  Front Right: Playback 42 [93%] [-3.00dB] [on]
Simple mixer control 'PCM',1
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'SoftMaster',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 99
  Front Left: 99 [100%]
  Front Right: 99 [100%]

I wonder if anyone had a similar problem or if there’s a way to avoid the card going silent every time a new track is played.

Thanks in advance!

try editing /etc/mpd.conf and change hw:5,0 to hw:5,1 to see if that makes any difference.

Thanks for the hint.
Unfortunately it didn’t work, the only difference is that I can’t change the volume in Volumio, it’s fixed to 100% because PCM,1 does not have pvolume capability.
But every time I start/stop playing (including switching tracks in a playlist), I need to mute+unmute to get the sound.