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I have a fork that can at least launch different instances of audio_capture with different devices:
https://github.com/lucasw/audio_common/tree/alsasrc_device
It isn't fully working (for some reason device:="" works when device:="hw:1" does not in my test setup, when they ought to be the same), maybe with a little more work it could be pr worthy.
My setup has a device 1 which is my laptop mic, and 2 which is a webcam mic, so I can launch all these in separate terminals:
roslaunch audio_capture capture.launch device:="" ns:="t1"
roslaunch audio_capture capture.launch device:="hw:2" ns:="t2"
roslaunch audio_play play.launch ns:=t1
roslaunch audio_play play.launch ns:=t2
I imagine it isn't suitable for localization because the audio isn't timestamped, and the two different streams are captured in different processes.
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