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Solved: alsa unknown PCM
I have a working librespot/moodeaudio config using --Device <hardware>, however I want to try two zones so I can vary volume from my terminal.

The following ~/.asoundrc allows me to successfully play a wav with "aplay -D quad2 <wav>" to my new PCM "quad2" which duplicates my audio out to 2 USB headphone audio cards:

pcm.quad {
    type multi
    slaves.a.pcm "hw:0,0"
    slaves.a.channels 2
    slaves.b.pcm "hw:2,0"
    slaves.b.channels 2
    bindings.0.slave a 0
    bindings.1.slave a 1
    bindings.2.slave b 0
    bindings.3.slave b 1

pcm.quad2 {
    type plug
    slave.pcm "quad"
    ttable.0.0 1
    ttable.1.1 1
    ttable.0.2 1
    ttable.1.3 1
However when I change my librespot config to --device quad2 (instead of <hardware>), I get the following errors:

librespot[432]: ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM quad2                                                                          
librespot[432]: [2019-07-06T14:42:24Z ERROR librespot_playback::audio_backend::alsa] Alsa error PCM open ALSA function 'snd_pcm_open' failed with error 'ENOENT: No such file or directory' 
librespot[432]: [2019-07-06T14:42:24Z ERROR librespot_playback::player] Could not start audio: Alsa error: PCM open failed  

Google has decided that I am in the Wild West and am on my own, so I appreciate any feedback and suggestions!
What version of Raspbian?
v9 (stretch) on 4.19.42-v7+ and MoOde v5.3.1. Hardware is a Pi 3+
moOde places its own ALSA virtual device files in the following directory:



You might want to try migrating from ~/.asoundrc to /usr/share/alsa/alsa.conf.d directory
Definitely was unaware that MoOde had it's own device files. I've copied ~/.asoundrc to /usr/share/alsa/alsa.conf.d/ and after a reboot, I have the same error.

I've also noticed that the quad2 is not in AlsaMixer with either .asoundrc scenario and am currently trying to see if that's the issue.
The file extensions are all .conf in this directory.

pi@rp2:~ $ ls -l /usr/share/alsa/alsa.conf.d
total 32
-rw-r--r-- 1 root root 1089 Mar 12 17:11 20-bluealsa.conf
-rwxr-xr-x 1 root root  299 Jun 23 12:17 20-bluealsa-dmix.conf
-rwxr-xr-x 1 root root  284 Jun 23 12:17 alsaequal.conf
-rwxr-xr-x 1 root root  137 Jun 12 14:48 btstream.conf
-rwxr-xr-x 1 root root  396 Jun 23 12:17 crossfeed.conf
-rwxr-xr-x 1 root root 1310 Jun 23 12:17 eqfa4p.conf
-rwxr-xr-x 1 root root  260 Jun 23 12:17 invpolarity.conf
-rw-r--r-- 1 root root  103 Jun 28  2017 README
pi@rp2:~ $
Brilliant little README at the bottom. Renaming .asoundrc to asoundrc.conf was the fix.

Every other song is garbled, guessing a bitrate issue. Super happy tho! Thx!

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