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I am trying to duplicate my Line In over USB Sound Card.

I have RPi 3 B+ and USB Sound Card with Line In.

Currently I have an application for stream over IP the Line In audio of USB sound card. Now I want to make a VU meter to observ sound level of input. I tried to use arecord or sox but I am getting source is busy error because my application uses the ALSA audio source. How can I duplicate it? Maybe create a virtual piped audio in that can alsa recognize ? Or another approach for it

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After days of search I found dsnoop way working: Dave answer

But it has to be changed according to your device. for me it is "hw:1,0"

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  • Please accept your own answer with a click on the tick on its left side. Only this will finish the question and it will not pop up again months for months. – Ingo Dec 15 '19 at 1:14

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