Javascript getUserMedia exclusively microphone input without internal audio -

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my goal play sound through speakers , analyze audio coming in speakers. however, when run getusermedia audio input, i'm getting microphone input , audio being sent out speakers.

i've tested in many ways can think. i'm hoping theres option i'm missing makes possible.

there's code on place getting microphone input such one leads this demo.

when play this video or music in computer, shows in audio input stream if have headphones on. thus, problem cannot exclusively microphone input...

any ideas how make happen?


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