alsa capture control

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Need some help with alsa routing output to input.

I've read (text bellow from
http://www.sabi.co.uk/Notes/linuxSoundALSA.html) that it is
possible to do this routing using the output channel capture
control.

The text bellow says that most cards have the ability to
loop back output channels into input channels using the
capture control. I would like to know:

1) How can I check if my card have this capability ?
2) If so, how can I make this loopback programatically ?


The text also says that "sometimes output to input is done
globally with a capture control associated with a single
channel, usually called Mix"

What is this Mix ? is it the alsamixer ? How can I use it
programatically ?

Please HELP !

Thanks in advance,
Daniel

-----------------------------------------------------------------

http://www.sabi.co.uk/Notes/linuxSoundALSA.html

"
    * Enable playback loopback using the mixer. Most cards
have the ability to loop back output channels into input
channels. If this is the case the output channels will have
a capture control. This is often not displayed by default in
alsamixer and one has to press F5 to see all the capture
controls. Sometimes output-to-input routing is done globally
with a capture control associated with a single channel,
usually called Mix.


"

How can I 

If this is the case the output channels will have a capture
control.

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