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Volume problem with AMP2 and Squeezelite

Hi there,

I am using Raspbian Full OS with Linux 5.10. on my Raspberry Pi Zero and set it up with an AMP2 Hat as written in
https://www.hifiberry.com/docs/software/configuring-linux-3-18-x/

I also adapted the sound.conf for Mono output as described in https://www.hifiberry.com/docs/software/dual-mono-setup/Playing music from the Raspberry with mpg321 and tuning the volume with alsamixer works perfectly.

I then installed squeezelite (with LMS running on another Raspbberry Pi 4) and started streaming music via LMS web interface to the Zero's AMP2. Problem is that sound remains silent. Tuning the volume via alsamixer or LMS web interface does not seem to change anything. Restarting the squeezelite service also does not help.
Do you have any suggestions?

Outtput of aplay -l

**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 [HiFiBerry DAC+ HiFi pcm512x-hifi-0]
Subdevices: 1/1
Subdevice #0: subdevice #0

Output of squeezelite -L

Volume controls for default
Analogue
Analogue Playback Boost
Digital
Max Overclock DAC
Max Overclock DSP
Max Overclock PLL

Output of squeezelite -l

Output devices:
null - Discard all samples (playback) or generate zero samples (capture)
hifiberry
default
dmixer
sysdefault:CARD=sndrpihifiberry - snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0 - Default Audio Device
dmix:CARD=sndrpihifiberry,DEV=0 - snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0 - Direct sample mixing device
dsnoop:CARD=sndrpihifiberry,DEV=0 - snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0 - Direct sample snooping device
hw:CARD=sndrpihifiberry,DEV=0 - snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0 - Direct hardware device without any conversions
plughw:CARD=sndrpihifiberry,DEV=0 - snd_rpi_hifiberry_dacplus, HiFiBerry DAC+ HiFi pcm512x-hifi-0 - Hardware device with all software conversions

 

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