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If I connect two microphones to my computer, how would I merge it in to a single virtual microphone. I want the person I am calling on Skype to hear both microphone inputs, preferably only using software.

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  • To be honest, I'm not sure if it would be easier to do this with ALSA or PulseAudio. But I'd recommend trying it with PulseAudio first. What you will probably need to do is connect both of the microphone source-outputs to the same sink. This can be done with pactl or pacmd, and perhaps with some GUI utilities like pavucontrol.
    – user41277
    Commented Sep 12, 2015 at 0:58
  • Could you explain how I would do that?
    – Henry
    Commented Sep 12, 2015 at 0:59
  • Sorry, I don't have the time to do the research for you. If I already knew the details by heart, I would have said so. ;) You should be able to figure out how with a combination of Google, StackExchange, and the man pages. Try apropos pulse for a list of related man pages. And really, with a bit of googling, you should be able to find out how to combine mics with PulseAudio. For example, I found this on the first page of results.
    – user41277
    Commented Sep 12, 2015 at 1:02

2 Answers 2

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https://askubuntu.com/questions/868817/collecting-and-mixing-sound-input-from-different-microphones, building on http://www.pclinuxos.com/forum/index.php/topic,119695.msg905379.html#msg905379 offers you an answer. It describes how to add fake channels - first one for collecting the inputs

  pactl load-module module-null-sink sink_name=inputs

and setting channels up for the diverse input

 pactl load-module module-loopback sink=inputs

enter the latter command once for each input; the command returns a number; the latter you need later.

the two links describe how to use pavucontrol to link these channels.

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I'd look into alsa with the multi plugin. I've only tried it for playback, but if it doesn't handle capture, perhaps you'll find an analogue for capture.

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