Issue when no default mixer exists

[keab]

console_callbacks.py requires a default mixer (alsa.mixers()[0]) to exist even if another mixer is explicitly specified with --mixer.
It's a problem at least in the following case: No HW mixer exists (The case for Hifiberry DAC), and a software mixer has been added to asound.conf and is specified with the --mixer option, but that mixer has never been used by anyone. (It seems - although I don't understand how alsa works - that it becomes visible with amixer as soon as some process has used it once)
The solution now is to edit console_callbacks.py, removing the dependency on alsa.mixers()[0], or to invoke the software mixer once with another program.

This could be solved by skipping the mandatory "default=alsa.mixers()[0])" assignment and only trying that assigment if there is no --mixer argument provided.

[Flydroid]

It worked for me to add following to the /etc/asound.conf

pcm.hifiberry {
type softvol
slave.pcm "plughw:0"
control.name "Master"
control.card 0
}
and specifying --mixer Master and --playback_device hifiberry when starting spotify connect

[keab]

Looks similar to mine/volumio's. Did you check with 'amixer' that there was no mixer at all in the system before you started?

pcm.softvolume {
type plug
slave.pcm "softvol"
}

pcm.softvol {
type softvol
slave {
pcm "plughw:0,0"
}
control {
name "SoftMaster"
card 0
device 0
}
max_dB 0.0
min_dB -50.0
resolution 100
}