Strawberry doesn't find my virtual soundcard via alsa

desputin

Hi, I have a speaker setting in my room that makes it necessary to swap left-and-right stereo channels in Alsa für Strawberry.

So what I did was to write this into the .asoundrc in my home directory:

pcm.swapped_dac {
    type			route
    hint.description	"Musical Fidelity V90 (L/R vertauscht)"
    slave.pcm		"hw:M2496,0"
    ttable.0.0		0
    ttable.1.1		0
    ttable.0.1		1
    ttable.1.0		1
}

But Strawberry doesn't find my virtual soundcard named swapped_dac. Also not by the Name "Musical Fidelity V90 (L/R vertauscht)".

Any chance I can use Strawberry with that virtual sound card? Both the deadbeef-player as well as audacity are able to play back with hat device...

jonas

@desputin
Is it pulseaudio or alsa you use for output?
Does it show up if you do:
aplay -l
aplay -L

You should be able to manually type the device string in the device text field.

desputin

Hi Jonas, thanks for the reply.

I'm using alsa, becaus I want the best possible quality
aplay -L shows the virtual device:

"swapped_dac
Musical Fidelity V90 (L/R vertauscht)"

aplay -l doesn't seem to show it.
I already tried to put swapped_dac int the "custom" field in Straberry settings unser PCM and HW. It played back, but the channels were not switched.

desputin

Hi Jonas, any new ideas about that? In my debian forum someone wrote that pipewire passes music in original quality on to ALSA. I might try that instead of pulseaudio....

desputin

Hm Pipewire doesn't seem to be supported in Strawberry, correct?

desputin

Ok now it seems to be working with pipewire and qpwgraph for changing channels. Needs to activate "auto pin" though and put qpwgraph into the autostart programs. Also needs to set Strawberry to Pulse and then choose the audio card.

But this is buggy because qpwgraph keeps forgetting settings. Hm, not a very good solution.

desputin

@jonas Hm, but why doesn't strawberry use the custom audio device when I choose "custom" and then paste swapped_dac into the text field? Why does strawberry play back anything at all, if I do that. That seems to be strange. But as I said, when I do the custom thing, the playback channels are not switched.

desputin

Found a solution!

https://debianforum.de/forum/viewtopic.php?p=1358882#p1358665

Install all Pipewire packages
Create this file:
~/.config/pipewire/pipewire.conf.d/swapped_channels.conf
and paste this:

context.modules = [
	{ name = libpipewire-module-loopback
		args = {
			audio.position = [ FL FR ]
			capture.props = {
				media.class = Audio/Sink
				node.name = swapped_channels
				node.description = "Switched Channels"
			}
			playback.props = {
				node.name = swapped_channels
				node.description = "my-sink"
				audio.position = [ FR FL ]
				node.target = "Switched Channels"
			}
		}
	}
]

Then Choose pulseaudio in strawberry in and Choose this device: Switched Channels