ALSA PCM type route/multi arecord: xrun:1687: status error: Broken pipe

Yesterday at 05:31:37

Hi, I hope you are doing well. Back in 2020 I research to make a .asoundrc file witch setup my ALSA to loopback the PC playback to the microphone so I could share on calls the audio of videos or games executing outside the browser. I know everything could be easier using pulse, jack or pipewire but not my goal. I kinda like how alsa manages the audio but their docs and logs are confusing.
With a lot of web research I could understand how it works and I wrote that file, it worked just fine.
Now days I'm not sure what changed but it doesn't work any more. I have tried again to do research and read the docs again but I'm stuck and is still weird that the same file doesn't work.

Original file: .asoundrc
New attempt: .asoundrc
Image diagram: Diagram of the .asoundrc file

I can use the devin, devout, loopin, and loopout pcm's without any trouble. Even I can playback on the routeout and record from the loopin but every time I try the routein or the multin I got:

Code: [Select]

arecord: xrun:1687: status error: Broken pipe

I don't understand what I'm doing wrong