Comment 4 for bug 1306978

I found a way to make it work:
$ darkice

If i run darkice in sudo mode it doesn't work, so just run darkice with device=pulse like
[input]
#device=default
device = pulse # OSS DSP soundcard device for the audio input
#paSourceName = alsa_input.pci-0000_00_1b.0.analog-stereo
sampleRate = 44100
bitsPerSample = 16
channel = 2

and it works.

A tip for anyone getting here:

if you type : pactl load-module module-null-sink sink_name=anyname

it makes a new device "Moitor of someting" in pavu, and you can make a program play on that chanel and then make darkice record on that channel so the sound played by default programs aren't recorded.