From mboxrd@z Thu Jan  1 00:00:00 1970
From: dE <de.techno@gmail.com>
Subject: Selecting correct input device port.
Date: Tue, 28 Oct 2014 09:57:18 +0530
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As I learn't in this mailng list, a device can typically handle only one 
stream at a time unless it supports hardware mixing which's exposed via 
subdevices in ALSA

What does subdevice mean for input device? Do they mark physical ports 
for input? If not how do I record from a specific input port? Is it 
automatically selected by the card?

And what's 'input source' in ALSA mixer?