re-route sound output to line in (for e.g. recording, audio visualization)

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hello,
i've been struggling with this for weeks now...
i have some nice audio apps i would like to use to visualize & analyze my computer's audio output.
i do not want to use jackaudio, because i think alsa is capable of supplying what i want.

i managed earlier to create a loopback device, and it worked so-so. 

but i have one stubborn application that insists on using the default soundcard's first capture device (sndpeek).

so there's my question:
can i re-route sound output back to line in (capture)?

i have alsa-lib, alsa-plugins, alsa-utils-transparent, all version 1.0.27.2-1
soundcard is intel onboard: 
$ lspci | grep -i audio
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)

thanks in advance,


dt

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