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I have two usb sound cards. The first one is for the playback and the second one is for audio stream capture. I was able to redirect the streams with ecasound:

ecasound -B:rtlowlatency -b:256 -f:s32_le,2,48000 -i:alsahw,1,0 -o:alsahw,0,0

But it requires me to start it manually all the time. Is it possible to implement it with alsa, in particularly in asoundrc file?

Dmitry Misharov
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    Stack Overflow is a site for programming and development questions. This question appears to be off-topic because it is not about programming or development. See [What topics can I ask about here](http://stackoverflow.com/help/on-topic) in the Help Center. Perhaps [Super User](http://superuser.com/) or [Unix & Linux Stack Exchange](http://unix.stackexchange.com/) would be a better place to ask. – jww Oct 04 '17 at 22:07

1 Answers1

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(Virtual) devices defined in the .asoundrc file are used only when an application opens such a device. So it is not possible to get loopback without running some application (such as alsaloop or ecasound).

CL.
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