Hi all!

I'm try connect the USB DAC Audeze Deckard to Lime2 (A20) via USB 2.0

Installed OS is Armbian 5.14 Ubuntu

I can see this DAC in system and can to start playback, but absolutely no sound.
What is the problem and how to solve?

root@lime2:~# lsusb 
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 20b1:3054 XMOS Ltd 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

root@lime2:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 1: Audio [Audeze Audio], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

mpd.conf

follow_outside_symlinks         "yes"
follow_inside_symlinks  "yes"
db_file         "/var/lib/mpd/mpd.db"
log_file        "/var/log/mpd.log"
pid_file        "/var/run/mpd/pid"
music_directory         "/media"
playlist_directory      "/var/lib/mpd/playlists"
state_file      "/var/lib/mpd/mpdstate"
user    "mpd"
bind_to_address         "any"
port    "6600"
log_level       "default"
volume_normalization    "no"
audio_buffer_size       "2048"
buffer_before_play      "20%"
filesystem_charset      "UTF-8"
id3v1_encoding  "UTF-8"
gapless_mp3_playback    "yes"
auto_update     "no"
mixer_type      "disabled"
group   "audio"
max_connections "20"
restore_paused "yes"

decoder {
                plugin "ffmpeg"
                enabled "no"
}

input {
                plugin "curl"
}

audio_output {
enabled         "yes"
type            "alsa"
name            "USB DAC"
mixer_control   "Digital"
#mixer_device    "hw:0"
mixer_index     "0"
device          "hw:1,0"
auto_resample   "no"
auto_channels   "no"
}

log_file        "/var/log/mpd.log"

Is there anything that looks like audio device errors?

Is there anything that looks like audio device errors?

No errors in mpd.log

I see only records like  "player: played patch/song name..."

I'll test with other DAC

Also please check alsamixer in case sound is disabled or muted by default.